Fairly simple genetics question...

[Cofo]

Suppose an animal has a gene for coat color that is sex-linked (X-linkage) and incompletely dominant, and in which females with an AA genotype have a black coat color; aa individuals have a yellow color; and those with Aa have a marble coloration. If a marble female was crossed with a yellow male, then each of the following might result under normal Mendelian conditions EXCEPT one. Which one is the EXCEPTION?

Black male
Black female
Yellow male
Yellow female
Marble female

I am almost certain the answer is Black female. Can anyone evoke me to have full certitude please?

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[jmukid]

I think its black females also. A cross of Aa with aa will produce 50% Aa and 50% aa. No AA is produced which is the genotype for black females.

 

[HannibalLecter]

Cofo, there was a previous thread mentioning this same exact question, I think you will find more answers there:

http://forums.studentdoctor.net/showthread.php?t=841743