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Elina [12.6K]
4 years ago
7

The diagram shows one process during sexual reproduction. After fertilization, the zygote contains 28 chromosomes. What is the n

umber of chromosomes (n) present in the gametes?
A) 7
B) 14
C) 28
D) 56
Biology
2 answers:
pychu [463]4 years ago
8 0
B)14

It is halved due to one parent having some genes for the offspring and the other to complete the 28 genes.
melomori [17]4 years ago
7 0

Answer:

The correct answer would be B) 14.

In sexual reproduction, gametes are haploid cells formed after meiotic division of germ cells.

Meiosis is a cell division which results in the formation of four daughter cells from a single parent or germ cell. Each daughter cell contains half the number of chromosome present in the parent cell.

The haploid gametes fuse to form diploid zygote that is, the fertilization restored the diploid chromosomal number.

Now, the number of chromosomes in the zygote is 28. Thus, the number of chromosomes in gametes must be half of 28 that is, 14.

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A woman produces an egg with 24 chromosomes, including 2 copies of chromosome 21. If the egg is fertilized by a normal sperm, th
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Answer:

47

Explanation:

We all know that gametes like egg cell and sperm have haploid set of chromosomes but here as per this question she has produced 2 copies of chromosome 21. For the sake of maintaining haploidy, she was supposed to have only a single copy of chromosome 21 as a result of which her egg cell was supposed to have 23 chromosomes not 24.

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