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प्रश्न
In humans, ______ chromosome is responsible for maleness.
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उत्तर
In humans, Y chromosome is responsible for maleness.
Explanation:
The Y chromosome is responsible for maleness in humans. The presence of the Y chromosome causes the development of male characteristics.
XX → Female
XY → Male
Therefore, the Y chromosome is responsible for maleness in humans.
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संबंधित प्रश्न
Explain the process of fertilization in human beings.
When a cell reproduces, what happens to its DNA?
The diagram given below is that of a developing human foetus. Study the diagram and then answer the questions that follow:
- Label the parts numbered 1 to 3 in the diagram.
- Mention any two functions of the part labelled 2 in the diagram.
- Explain the significance of the part numbered 3 in the diagram.
- Define the term ‘Gestation’. What is the normal gestational period of the developing human embryo?
- Mention the sex chromosomes in a male and female embryo.
Describe in brief the structure of placenta
Give a biological explanation for the following.
The placenta is an important structure for the development of a foetus.
What are the organs in humans which produce the gametes?
Why does menstruation occur?
Which structure in human female is equivalent to the vas deferens in the male?and in what respect the structures are equivalent?
The ratio of the number of chromosomes in a human zygote and a human sperm is ______
The germ cell A produced by a person X is round in shape and it fuses with another germ cell B having a long tail and produced by a person Y. The fusion of A and B produces a new cell C. The cell C divides repeatedly and grows inside the organ D of person X to form E in which the body features of the unborn baby are not much developed. E grows further to form F in which the various body features of the unborn baby (like hands, legs, head, eyes, and ears, etc.) can be identified. F grows further and ultimately forms a baby. What are A, B, C, D, E and F? Out of the two persons X and Y, which one is male and which one female?
Write two examples of sexually transmitted diseases caused by bacteria.
Describe in brief the role of ureter in human male reproductive system.
Give appropriate term of the following:
The onset of reproductive phase in a young female.
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The male homologue of the female clitoris is ____________.
Mention the importance of the position of the testes in humans.
What is the composition of semen?
During adolescence, reproductive phase starts and ______.
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Which of the following is an example of a secondary sexual characteristic in humans?
