2 biology questions???

A trait controlled by four alleles is said to have _____?





A)homologous alleles


B)autosomes


C)hybridization


D)multiple alleles








3. When roan cattle are mated, 25% of the offspring are red, 50% are roan, and 25% are white. Upon examination, it can be seen that the coat of a roan cow consists of both red and white hairs. This trait is one controlled by _____?








A)multiple alleles


B)codominant alleles


C)sex-linked genes


D)polygenic inheritance

2 biology questions???
For the first question, the answer is pretty obvious in the wording. If there are different genes that affect a single trait, it is controlled by multiple alleles, right? Be sure you understand what the other choices are.








For the second question, the answer lies in the fact that AA = red, Aa = roan, and aa = white. Because both red and white can be expressed at the same time (in other words, red doesn't cover up white), you would say that they are co-dominant.
Reply:multiple alleles








codominant alleles