Antonio is colorblind. His partner Emilia is not colorblind nor is she a carrier (heterozygote)for colorblindness. The offspring of this couple would
A)be sons with colorblindness and daughters with color vision.
B)be colorblind daughters and sons with normal color vision.
C)all be colorblind.
D)all have normal color vision.

Question

Antonio is colorblind. His partner Emilia is not colorblind nor is she a carrier (heterozygote)for colorblindness. The offspring of this couple would
A)be sons with colorblindness and daughters with color vision.
B)be colorblind daughters and sons with normal color vision.
C)all be colorblind.
D)all have normal color vision.

Quizplus · Accepted Answer

Colorblindness is a recessive X-linked trait. Since Emilia is not a carrier, she has two normal X chromosomes. Antonio, being colorblind, has one X chromosome with the colorblind gene and one Y chromosome. Their daughters will inherit one normal X from Emilia and one X from Antonio, making them carriers but not colorblind. Their sons will inherit a normal X from Emilia and a Y from Antonio, resulting in normal color vision.

Antonio Is Colorblind