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.
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.
We agree with the statement that Only variations that confer an advantage to an individual organism will survive in a population. All the variations do not have an equal chance of surviving in the environment in which they find themselves. The chances of surviving depend on the nature of variations.Read more
We agree with the statement that Only variations that confer an advantage to an individual organism will survive in a population. All the variations do not have an equal chance of surviving in the environment in which they find themselves. The chances of surviving depend on the nature of variations. Different individual would have different kind of advantages. A bacteria that can withstand heat will survive better in a heat wave. Selection of variants by environmental factors forms the basis for revolutionary process.
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel. (ii) This fluid pRead more
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel.
(ii) This fluid protects the sperms from the acids present in the urethra.
(iii) This fluid provides nutrition to sperms in the form of fructose, calcium and some enzymes.
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.
Explain 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 lessOnly variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement? Why or why not?
We agree with the statement that Only variations that confer an advantage to an individual organism will survive in a population. All the variations do not have an equal chance of surviving in the environment in which they find themselves. The chances of surviving depend on the nature of variations.Read more
We agree with the statement that Only variations that confer an advantage to an individual organism will survive in a population. All the variations do not have an equal chance of surviving in the environment in which they find themselves. The chances of surviving depend on the nature of variations. Different individual would have different kind of advantages. A bacteria that can withstand heat will survive better in a heat wave. Selection of variants by environmental factors forms the basis for revolutionary process.
See lessWhat is the role of the seminal vesicles and the prostate gland?
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel. (ii) This fluid pRead more
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel.
See less(ii) This fluid protects the sperms from the acids present in the urethra.
(iii) This fluid provides nutrition to sperms in the form of fructose, calcium and some enzymes.