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Brilliant_brown [7]
3 years ago
5

At what point in cell division is a chromosome lost so that, after fertilization with a normal gamete, the result is a human zyg

ote with 45 chromosomes, including a single X chromosome?
I. an error in anaphase I
II. an error in anaphase II
III. an error of the first postfertilization mitosis
IV. an error in pairing
Biology
1 answer:
malfutka [58]3 years ago
7 0

Answer:

The correct answer will be option-A

Explanation:

Chromosomal abnormalities are caused when the chromosome pair fails to disintegrate through a process called non-disjunction. The non-disjunction of chromosomes usually takes place at the anaphase I or II of meiosis I which involves the X and Y chromosomes.  

The abnormality observed with 45 chromosomes or reduction in one sex chromosome or 45, XO is caused when one X copy of a chromosome is completely absent in the cell.  

The cause for the loss of one chromosome is the non-disjunction during meiosis I.

Thus, option-A is the correct answer.

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