The ability to differentiate colors in the red and green pigments is governed by

Question

The ability to differentiate colors in the red and green pigments is governed by two genes which are close together on the X chromosome. Defects in green color vision are due to mutations as one locus, known as the CBD locus (color blindness duetan). About 5% of western European males are mutant for this locus. Mutations at a second locus known as the CBP (color blindness---protan) are less common among western Europeans. About 1% of the western European males are mutant at this locus. A woman who has the green type of color blindness marries a man with the red type of color blindness. What are the phenotypes and genotypes of their offspring?

Explanation / Answer

Answer
Let us suppose the green normal locus is GG and mutant locus represent by gg and the red normal locus is RR and red colour mutant is denoted by rr
Then
   Green and red are closely relative
       Mother ggRR. X. Father. GGrr
Gametes.        g. R. G. r
Genotype       gG gr. RG. Rr

Phenotype

Gg gr RG Rr
Gg   GGgg   Gggr   RGGg   RGgr
gr   Gggr ggrr   RGgr   Rgrr
RG RGGg   RGgr   RRGG   RRGr
Rr   RGgr Rrgr   RRGr   RRrr

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.