Genes on the X chromosome of mammals and Drosophila are particularly suitable for genetic study because
A)males have only one X and most genes behave as haploids.
B)females have only one X and most genes behave as haploids.
C)the X chromosome is large and many more genes are located there.
D)when present as Barr bodies they are exposed for electron microscopic examination.
E)they behave as diploids in females.

Question

Quizplus · Accepted Answer

In mammals, males have only one X chromosome and thus most genes on it behave as haploids. This makes it easier to study the inheritance and expression of traits linked to specific genes on the X chromosome. Similarly, in Drosophila, males have only one X chromosome and most genes on it behave as haploids, making it a useful model organism for studying genetics.

Genes on the X Chromosome of Mammals and Drosophila Are