Genes on the X Chromosome of Mammals and Drosophila Are

Multiple Choice

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.