This information is not sufficient. For considering a trait as dominant or recessive, we need data of at least three generations. This data is about only two generations.
This information is not sufficient. For considering a trait as dominant or recessive, we need data of at least three generations. This data is about only two generations.
Classification is influenced by evolution. The modern system of classification is also called phylogenetic classification; which means it is based on evolutionary relationships. Organism classification is based on the relative similarities and differences between the species. Resemblances of humansRead more
Classification is influenced by evolution. The modern system of classification is also called phylogenetic classification; which means it is based on evolutionary relationships. Organism classification is based on the relative similarities and differences between the species. Resemblances of humans are due to the fact that they evolved from a common ancestor, and their differences are due to adaptations to various types of climate.
Homologus organs are those organs which have the same basic structural design and origin but have different functions. For Example: The forelimbs of humans and the wings of birds look different externally but their skeletal structure is similar. Analogus organs are those organs which have the differRead more
Homologus organs are those organs which have the same basic structural design and origin but have different functions.
For Example: The forelimbs of humans and the wings of birds look different externally but their skeletal structure is similar.
Analogus organs are those organs which have the different basic structural design and origin but have similar functions.
For Example: The wings of birds and insects.
Dogs have a variety of genes that govern coat colour. There are at least eleven identified gene series (A, B, C, D, E, F, G, M, P, S, T) that influence coat colour in dog. A dog inherits one gene from each of its parents. The dominant gene gets expressed in the phenotype. For example, in the B serieRead more
Dogs have a variety of genes that govern coat colour. There are at least eleven identified gene series (A, B, C, D, E, F, G, M, P, S, T) that influence coat colour in dog.
A dog inherits one gene from each of its parents. The dominant gene gets expressed in the phenotype. For example, in the B series, a dog can be genetically black or brown.
Let us assume that one parent is homozygous black (BB), while the other parent is homozygous brown (bb).
In this case, all the offsprings will be heterozygous (Bb).
Since black (B) is dominant, all the offsprings will be black. However, they will have both B and b alleles.
If such heterozygous pups are crossed, they will produce 25% homozygous black (BB), 50% heterozygous black (Bb), and 25% homozygous brown (bb) offsprings.
Fossil provide us evidence about 1. The organisms that lived long ago such as the time period during which they lived, their structure etc. 2. Evolutionary development of species i.e., line of their development. 3. Connecting links between two groups. For example, feathers present in some dinosaursRead more
Fossil provide us evidence about
1. The organisms that lived long ago such as the time period during which they lived, their structure etc.
2. Evolutionary development of species i.e., line of their development.
3. Connecting links between two groups. For example, feathers present in some dinosaurs means that birds are very closely related to reptiles.
4. Which organisms evolved earlier and which later.
5. Development of complex body designs from the simple body designs.
The evidence for the origin of life from inanimate matter, was provided through an experiment, conducted in 1953, by Stanley L. Miller and Harold C. Urey. In experiment, they assembled an atmosphere containing molecules like ammonia, methane and hydrogen sulphide, but no oxygen, over water. This wasRead more
The evidence for the origin of life from inanimate matter, was provided through an experiment, conducted in 1953, by Stanley L. Miller and Harold C. Urey. In experiment, they assembled an atmosphere containing molecules like ammonia, methane and hydrogen sulphide, but no oxygen, over water. This was similar to atmosphere that thought to exist on early earth . This was maintained at a temperature just below 100°C and sparks were passed through the mixture of gases to simulate lightning. At the end of a week, 15% of the carbon from methane, had been converted to simple compounds of carbon including amino acids which make up protein molecules and support the life in basic form. Thus, amply suggesting that life arose afresh on earth.
Sexual reproduction causes more viable variations due to the following reasons: 1. Error in copying of DNA, which are not highly significant. 2. Random seggregation of paternal and maternal chromosome at the time of gamete formation. 3. Exchange of genetic material between homologous chromosomes durRead more
Sexual reproduction causes more viable variations due to the following reasons:
1. Error in copying of DNA, which are not highly significant.
2. Random seggregation of paternal and maternal chromosome at the time of gamete formation.
3. Exchange of genetic material between homologous chromosomes during formation of gametes.
4. Accumulation of variations occured due to sexual reproduction over generation after generation and selection by nature created wide diversity.
In case of asexual reproduction, only the very small changes due to inaccuracies in DNA copying pass on the progeny. Thus, offsprings of asexual reproduction are more or less genetically similar to their parents. So, it can be concluded that evolution in sexually reproducing organisms proceeds at a faster pace than in asexually repoducing organisms.
In human beings, equal genetic contribution of male and female parents is ensured in the progeny through inheritance of equal number of chromosomes from both parents. There are 23 pairs of chromosomes All human chromosomes are not paired. Out of these 23 pairs, the first 22 pairs are known as autosoRead more
In human beings, equal genetic contribution of male and female parents is ensured in the progeny through inheritance of equal number of chromosomes from both parents. There are 23 pairs of chromosomes All human chromosomes are not paired. Out of these 23 pairs, the first 22 pairs are known as autosomes and the remaining one pair is known as sex chromosomes represented as X and Y. Females have a perfect pair of two X sex chromosomes and males have a mismatched pair of one X and one Y sex chromosome.
During the course of reproduction, as fertilization process takes place, the male gamete (haploid) fuses with the female gamete(haploid) resulting in formation of the diploid zygote. The zygote in the progeny receive an equal contribution of genetic material from the parents. Out of 23 pairs of chromosomes in progeny, male parent contributes 22 autosomes and one X or Y chromosome and female parent contributes 22 autosomes and one X chromosome.
An example of homologous organs is
(b) our teeth and an elephant's tusks.
(b) our teeth and an elephant’s tusks.
See lessIn evolutionary terms, we have more in common with.
(a) a Chinese school-boy.
(a) a Chinese school-boy.
See lessA study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive? Why or why not?
This information is not sufficient. For considering a trait as dominant or recessive, we need data of at least three generations. This data is about only two generations.
This information is not sufficient. For considering a trait as dominant or recessive, we need data of at least three generations. This data is about only two generations.
See lessHow are the areas of study – evolution and classification – interlinked?
Classification is influenced by evolution. The modern system of classification is also called phylogenetic classification; which means it is based on evolutionary relationships. Organism classification is based on the relative similarities and differences between the species. Resemblances of humansRead more
Classification is influenced by evolution. The modern system of classification is also called phylogenetic classification; which means it is based on evolutionary relationships. Organism classification is based on the relative similarities and differences between the species. Resemblances of humans are due to the fact that they evolved from a common ancestor, and their differences are due to adaptations to various types of climate.
See lessExplain the terms analogous and homologous organs with examples.
Homologus organs are those organs which have the same basic structural design and origin but have different functions. For Example: The forelimbs of humans and the wings of birds look different externally but their skeletal structure is similar. Analogus organs are those organs which have the differRead more
Homologus organs are those organs which have the same basic structural design and origin but have different functions.
For Example: The forelimbs of humans and the wings of birds look different externally but their skeletal structure is similar.
Analogus organs are those organs which have the different basic structural design and origin but have similar functions.
See lessFor Example: The wings of birds and insects.
Outline a project which aims to find the dominant coat colour in dogs.
Dogs have a variety of genes that govern coat colour. There are at least eleven identified gene series (A, B, C, D, E, F, G, M, P, S, T) that influence coat colour in dog. A dog inherits one gene from each of its parents. The dominant gene gets expressed in the phenotype. For example, in the B serieRead more
Dogs have a variety of genes that govern coat colour. There are at least eleven identified gene series (A, B, C, D, E, F, G, M, P, S, T) that influence coat colour in dog.
A dog inherits one gene from each of its parents. The dominant gene gets expressed in the phenotype. For example, in the B series, a dog can be genetically black or brown.
Let us assume that one parent is homozygous black (BB), while the other parent is homozygous brown (bb).
In this case, all the offsprings will be heterozygous (Bb).
See lessSince black (B) is dominant, all the offsprings will be black. However, they will have both B and b alleles.
If such heterozygous pups are crossed, they will produce 25% homozygous black (BB), 50% heterozygous black (Bb), and 25% homozygous brown (bb) offsprings.
Explain the importance of fossils in deciding evolutionary relationships.
Fossil provide us evidence about 1. The organisms that lived long ago such as the time period during which they lived, their structure etc. 2. Evolutionary development of species i.e., line of their development. 3. Connecting links between two groups. For example, feathers present in some dinosaursRead more
Fossil provide us evidence about
See less1. The organisms that lived long ago such as the time period during which they lived, their structure etc.
2. Evolutionary development of species i.e., line of their development.
3. Connecting links between two groups. For example, feathers present in some dinosaurs means that birds are very closely related to reptiles.
4. Which organisms evolved earlier and which later.
5. Development of complex body designs from the simple body designs.
What evidence do we have for the origin of life from inanimate matter?
The evidence for the origin of life from inanimate matter, was provided through an experiment, conducted in 1953, by Stanley L. Miller and Harold C. Urey. In experiment, they assembled an atmosphere containing molecules like ammonia, methane and hydrogen sulphide, but no oxygen, over water. This wasRead more
The evidence for the origin of life from inanimate matter, was provided through an experiment, conducted in 1953, by Stanley L. Miller and Harold C. Urey. In experiment, they assembled an atmosphere containing molecules like ammonia, methane and hydrogen sulphide, but no oxygen, over water. This was similar to atmosphere that thought to exist on early earth . This was maintained at a temperature just below 100°C and sparks were passed through the mixture of gases to simulate lightning. At the end of a week, 15% of the carbon from methane, had been converted to simple compounds of carbon including amino acids which make up protein molecules and support the life in basic form. Thus, amply suggesting that life arose afresh on earth.
See lessExplain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?
Sexual reproduction causes more viable variations due to the following reasons: 1. Error in copying of DNA, which are not highly significant. 2. Random seggregation of paternal and maternal chromosome at the time of gamete formation. 3. Exchange of genetic material between homologous chromosomes durRead more
Sexual reproduction causes more viable variations due to the following reasons:
1. Error in copying of DNA, which are not highly significant.
2. Random seggregation of paternal and maternal chromosome at the time of gamete formation.
3. Exchange of genetic material between homologous chromosomes during formation of gametes.
4. Accumulation of variations occured due to sexual reproduction over generation after generation and selection by nature created wide diversity.
In case of asexual reproduction, only the very small changes due to inaccuracies in DNA copying pass on the progeny. Thus, offsprings of asexual reproduction are more or less genetically similar to their parents. So, it can be concluded that evolution in sexually reproducing organisms proceeds at a faster pace than in asexually repoducing organisms.
See lessHow is the equal genetic contribution of male and female parents ensured in the progeny?
In human beings, equal genetic contribution of male and female parents is ensured in the progeny through inheritance of equal number of chromosomes from both parents. There are 23 pairs of chromosomes All human chromosomes are not paired. Out of these 23 pairs, the first 22 pairs are known as autosoRead more
In human beings, equal genetic contribution of male and female parents is ensured in the progeny through inheritance of equal number of chromosomes from both parents. There are 23 pairs of chromosomes All human chromosomes are not paired. Out of these 23 pairs, the first 22 pairs are known as autosomes and the remaining one pair is known as sex chromosomes represented as X and Y. Females have a perfect pair of two X sex chromosomes and males have a mismatched pair of one X and one Y sex chromosome.
See lessDuring the course of reproduction, as fertilization process takes place, the male gamete (haploid) fuses with the female gamete(haploid) resulting in formation of the diploid zygote. The zygote in the progeny receive an equal contribution of genetic material from the parents. Out of 23 pairs of chromosomes in progeny, male parent contributes 22 autosomes and one X or Y chromosome and female parent contributes 22 autosomes and one X chromosome.