What's this an example of?

Question

A red-eyed female fruit fly is crossed with a red-eyed male fruit fly. All of the female offspring have red eyes but only one-half of the male offspring are red-eyed. The other half of the male offspring have white eyes. In this example, eye color in fruit flies:

A. is an X-linked trait
B. exhibits lack of dominance
C. is influenced by the environment
D. is controlled by several genes

I know I can cross out C. I kind of want to say A, but I'm not too sure. Can anyone help me out? Am I right or am I wrong?

Answer 1

i think it is a and if not it is b once i was doing a science paper and i googled a question and i found the lesson plan answer key!

Answer 2

A. Red eyes in fruit flies are controlled by an X-linked trait.

That means the females have two alleles for eye color while males only have one allele for eye color.

Look at the offspring. The white-eyed males indicate that these males got a white allele from their mothers. The mothers were all red-eyed, so they must have been carriers for white -- heterozygous mothers.

The red-eyed males indicate that these males got a red allele from their mothers.

The red-eyed females all got a red allele from their fathers on the X-chromosome from him. It didn't matter which allele they got from their mothers because they already had red from the fathers. Thus, all the female offspring were red-eyed.

Answer 3

The answer is A, it is X-linked dominant, and the mother is heterozygous and the father has the X-dominant. Half of the males are white eyed because the mother gives the recessive trait.

Answer 4

I think A is right