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प्रश्न
The ratio of the number of chromosomes in a human zygote and a human sperm is ______
विकल्प
2 : 1
3 : 1
1 : 2
1 : 3
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उत्तर
2 : 1
Explanation:
The number of chromosomes in human sperm is half the number of chromosomes in a zygote, i.e., their ratio is 2 : 1.
संबंधित प्रश्न
Name any three parts of the female reproductive system in human beings. Write one function of each.
Name the human male reproductive organ that produces sperms and also secretes a hormone. Write the functions of the secreted hormone.
Draw a sectional view of human female reproductive system and label the part where
(i) eggs develop.
(ii) fertilisation takes place.
(iii) fertilised egg gets implanted.
State whether human beings reproduce by sexual method or asexual method.
Which structures in human female are equivalent to the following structures in the male?
- testes
- vas deferens
- penis
In each case say in what respect the structures are equivalent?
What is the function of the placenta?
In human females, an event that indicates the onset of reproductive phase is :
(a) growth of body
(b) change in hair pattern
(c) change in voice
(d) menstruation
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?
Describe in brief the role of ureter in human male reproductive system.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
A zygote is the product of the fusion of male and female gametes.
