Biology Practice Problems Chromosome Abnormalities and Non-Mendelian Inheritance Practice Problems Solution: If nondisjunction occurs in meiosis II during game...

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Solution: If nondisjunction occurs in meiosis II during gametogenesis, what will be the result at the completion of meiosis?A. Two gametes will be n + 1 and two will be n - 1B. One gamete will be n + 1, one will be n - 1, and two will be nC. There will be three extra gametesD. All the gametes will be diploidE. Two of the four gametes will be haploid and two will be diploid

Problem

If nondisjunction occurs in meiosis II during gametogenesis, what will be the result at the completion of meiosis?

A. Two gametes will be n + 1 and two will be n - 1

B. One gamete will be n + 1, one will be n - 1, and two will be n

C. There will be three extra gametes

D. All the gametes will be diploid

E. Two of the four gametes will be haploid and two will be diploid


Solution

In nondisjunction, the separation of homologous pairs of chromosomes do not happen correctly (meiosis I) or sister chromatids do not separate during meiosis II. When this happens, one gamete gets two copies of a chromosome while the other gets none. This immediate effect (i.e. abnormal number of chromosomes) is known as aneuploidy.

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