Answer to Question #346940 in Genetics for ABh

Question

Identify the F1 generation from a colourblind father and a mother who is homozygous for colour vision.

Answer 1

Let the dominant allele of the A gene be responsible for normal color vision, and the recessive allele of this gene, respectively, will be responsible for color blindness in the male. Also the A gene is sex-linked.

We will conduct a cross corresponding to the above information:

P: X^AX^A (♀, normal) + X^aY (♂, colorblind)

↓

F1:

It turns out that in F1 there will be 50% of females who will be carriers of the recessive allele of the A gene (which will cause color blindness in males in F2), as well as 50% of males who will not experience problems with color vision.