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If cell X enters meiosis, and nondisjunction of one chromosome occurs in one of its daughter cells during meiosis II, how will this affect the gametes at the completion of meiosis? (A) All the gametes descended from cell X will be diploid. (B) Half of the gametes descended from cell X will be n+1 , and half will be n-1 . (C) One-quarter of the gametes descended from cell X will be n+1 , one-quarter will be n-1 , and half will be n . (D) Two of the four gametes descended from cell X will be haploid, and two will be diploid.



Answer :

Correct option (B) Half of the gametes descended from cell X will be n+1 , and half will be n-1 .

When X cell is enters in meiosis and non dis-junction of one chromosome occurs in one of its daughter cells during meiosis II , as a result (B) Half of the gametes descended from cell X will be n+1 , and half will be n-1 .

Non dis-junction can leads to individual to born female with one X which is turner syndrome, and female with XXX chromosome which is trisomy X, when  male with XXY , called klinefelter syndrome.

Non disjunction in meiosis II form the failure of sister chromatic to separate during anaphase II. Meiosis I proceeded without error, when 2 of the 4 daughter cells have normal complement of 23 chromosomes.

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