The sex-determining mechanism in humans is the XY type. Humans contain 23 pairs of chromosomes. 22 pairs of chromosomes are the same in both males and females, which are called autosomes. The 23rd pair is different in both sexes and is known as sex chromosome. Females have a pair of X chromosomes anRead more
The sex-determining mechanism in humans is the XY type. Humans contain 23 pairs of chromosomes. 22 pairs of chromosomes are the same in both males and females, which are called autosomes. The 23rd pair is different in both sexes and is known as sex chromosome.
Females have a pair of X chromosomes and males have X and Y chromosomes as sex chromosome. Sex of child in humans is determined by the type of male haploid gamete that fuses with the female egg. During spermatogenesis, males produce two types of gametes, half of the sperms have an X chromosome and the other half have a Y chromosome. The female egg always has an X chromosome.
So if the male gamete with the X chromosome fuses with the female egg, the child will be female and if the male gamete with the Y chromosome fuses with the female egg, the child will be male.
The given information is not enough to determine the traits- blood group A or O is dominant. In ABO blood grouping blood type A is always dominant whereas, the blood type O is always recessive. Here the father's blood group is A hence, it can either be homozygous (AA) or heterozygous (AO). The mothRead more
The given information is not enough to determine the traits- blood group A or O is dominant.
In ABO blood grouping blood type A is always dominant whereas, the blood type O is always recessive.
Here the father’s blood group is A hence, it can either be homozygous (AA) or heterozygous (AO).
The mother’s blood group is O and it is only possible if it is heterozygous (OO).
For the daughter to have blood group O the father must be heterozygous (AO) and mother must be (OO).
Genes located on different chromosomes will be inherited independently of each other. Mendel observed that, when peas with more than one trait were crossed, the progeny did not always match the parents. This is because different traits are inherited independently – this is the principle of independeRead more
Genes located on different chromosomes will be inherited independently of each other. Mendel observed that, when peas with more than one trait were crossed, the progeny did not always match the parents. This is because different traits are inherited independently – this is the principle of independent assortment.
Mendel conducted the experiments using Pisum sativum or pea plant. He selected homozygous tall (TT) and dwarf (tt) pea plants. He crossed the tall pea plant with the dwarf pea plant. It was observed that the F1 generation are all tall plants. Thus, it was concluded that the gene causing tallness iRead more
Mendel conducted the experiments using Pisum sativum or pea plant.
He selected homozygous tall (TT) and dwarf (tt) pea plants.
He crossed the tall pea plant with the dwarf pea plant.
It was observed that the F1 generation are all tall plants.
Thus, it was concluded that the gene causing tallness is dominant while the gene causing dwarfness is recessive.
The trait expressing itself in the hybrid is the dominant one.
This experiment proves Mendel’s first law of inheritance.
It states that when a pair of contrasting factors is brought in a hybrid, one factor inhibits the appearance of the other, one which inhibits is the dominant one and which is inhibited is recessive.
The variations provide stability to the population of various species by preventing them from getting wiped out during adverse conditions. The natural environment also changes, and variations in species which become suited to the environment help it to survive.
The variations provide stability to the population of various species by preventing them from getting wiped out during adverse conditions.
The natural environment also changes, and variations in species which become suited to the environment help it to survive.
How is the sex of the child determined in human beings?
The sex-determining mechanism in humans is the XY type. Humans contain 23 pairs of chromosomes. 22 pairs of chromosomes are the same in both males and females, which are called autosomes. The 23rd pair is different in both sexes and is known as sex chromosome. Females have a pair of X chromosomes anRead more
The sex-determining mechanism in humans is the XY type. Humans contain 23 pairs of chromosomes. 22 pairs of chromosomes are the same in both males and females, which are called autosomes. The 23rd pair is different in both sexes and is known as sex chromosome.
Females have a pair of X chromosomes and males have X and Y chromosomes as sex chromosome. Sex of child in humans is determined by the type of male haploid gamete that fuses with the female egg. During spermatogenesis, males produce two types of gametes, half of the sperms have an X chromosome and the other half have a Y chromosome. The female egg always has an X chromosome.
So if the male gamete with the X chromosome fuses with the female egg, the child will be female and if the male gamete with the Y chromosome fuses with the female egg, the child will be male.
See lessA man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
The given information is not enough to determine the traits- blood group A or O is dominant. In ABO blood grouping blood type A is always dominant whereas, the blood type O is always recessive. Here the father's blood group is A hence, it can either be homozygous (AA) or heterozygous (AO). The mothRead more
- The given information is not enough to determine the traits- blood group A or O is dominant.
- In ABO blood grouping blood type A is always dominant whereas, the blood type O is always recessive.
- Here the father’s blood group is A hence, it can either be homozygous (AA) or heterozygous (AO).
- The mother’s blood group is O and it is only possible if it is heterozygous (OO).
- For the daughter to have blood group O the father must be heterozygous (AO) and mother must be (OO).
See lessHow do Mendel’s experiments show that traits are inherited independently?
Genes located on different chromosomes will be inherited independently of each other. Mendel observed that, when peas with more than one trait were crossed, the progeny did not always match the parents. This is because different traits are inherited independently – this is the principle of independeRead more
Genes located on different chromosomes will be inherited independently of each other. Mendel observed that, when peas with more than one trait were crossed, the progeny did not always match the parents. This is because different traits are inherited independently – this is the principle of independent assortment.
See lessHow do Mendel’s experiments show that traits may be dominant or recessive?
Mendel conducted the experiments using Pisum sativum or pea plant. He selected homozygous tall (TT) and dwarf (tt) pea plants. He crossed the tall pea plant with the dwarf pea plant. It was observed that the F1 generation are all tall plants. Thus, it was concluded that the gene causing tallness iRead more
- Mendel conducted the experiments using Pisum sativum or pea plant.
- He selected homozygous tall (TT) and dwarf (tt) pea plants.
- He crossed the tall pea plant with the dwarf pea plant.
- It was observed that the F1 generation are all tall plants.
- Thus, it was concluded that the gene causing tallness is dominant while the gene causing dwarfness is recessive.
- The trait expressing itself in the hybrid is the dominant one.
- This experiment proves Mendel’s first law of inheritance.
- It states that when a pair of contrasting factors is brought in a hybrid, one factor inhibits the appearance of the other, one which inhibits is the dominant one and which is inhibited is recessive.
See lessHow does the creation of variations in a species promote survival?
The variations provide stability to the population of various species by preventing them from getting wiped out during adverse conditions. The natural environment also changes, and variations in species which become suited to the environment help it to survive.
The variations provide stability to the population of various species by preventing them from getting wiped out during adverse conditions.
See lessThe natural environment also changes, and variations in species which become suited to the environment help it to survive.