Question

From the following identify the statements that are CORRECT with respect to homologous and non-homologous region of X and Y chromosomes.

i. Non-homologous region of X chromosome is longer and contains more genes than that of non-homologous region of Y chromosome.

ii. X-linked genes are present on nonhomologous region of X-chromosome.

iii. Y-linked genes are present on homologous region of Y-chromosome.

iv. Crossing over occurs only between homologous regions of X and Y chromosomes.

Options

• i, ii and iii

• ii and iii

• i, ii and iv

• i and iii

Answer 1

i, ii and iv

Explanation:

Non-homologous regions of the Y-chromosome contain Y-linked genes.