Question 39
Is the chromosome number of a zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?

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Solution

The chromosome number of a zygote, embryonic cells and adult of a particular organism is always constant.The constancy is maintained because the cells in all these three structures undergo only mitotic divisions.

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Q. Is the chromosome number of a zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?

Q. The number of chromosomes present in each cell of embryo is 48, then the number of chromosomes present in the zygote of that organism is _______.

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(i) A zygote is always formed inside the body.
(ii) Zygote may represent "overwintering stage" in life cycle of an organism

Question 11
The number of chromosomes in parents and offsprings of a particular species remains constant due to

(a) doubling of chromosomes after zygote formation
(b) halving of chromosomes during gamete formation
(c) doubling of chromosomes after gamete formation
(d) halving of chromosomes after gamete formation

Q. Implantation of the zygote takes place at which of the following embryonic stages?

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Question 39 Is the chromosome number of a zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?

The chromosome number of a zygote, embryonic cells and adult of a particular organism is always constant.The constancy is maintained because the cells in all these three structures undergo only mitotic divisions.

Question 39
Is the chromosome number of a zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?