Siblings Billy and Sue are brother and sister, but g are not genetic copies of each other. For example, Sue inherited their mother's copy of chromosome 13 but their father's copy of chromosome 14, while her brother Billy inherited their father's copy of both chromosomes 13 and 14. This is an example of:

The options are

A.Independent assortment

B. Mutation

C. Crossing over

D. Non disjunction

The answer is A.Independent assortment

Explanation:

Independent assortment of genes involves the separation of genes during the formation and development of reproductive cells.

A boy has XY chromosome and a lady has XX chromosomes. This explains why Sue inherited the mother's copy of chromosome 13 but their father's copy of chromosome 14 while her brother Billy inherited their father's copy of both chromosomes 13 and 14. He inherited both due to the presence of XY chromosomes.

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