If color blindness is an X-linked recessive trait, what genotype in a father and a mother would be predicted to produce a 1:1 ratio of normal to color-blind offspring?

A.) Unaffected father and unaffected (non-carrier) mother
B.) Unaffected father and carrier mother
C.) Affected father and carrier mother
D.) Affected father and unaffected (non-carrier) mother

Question

Elren6lynwynni0eBurd Elren6lynwynni0eBurd

23-07-2016
Biology

contestada

If color blindness is an X-linked recessive trait, what genotype in a father and a mother would be predicted to produce a 1:1 ratio of normal to color-blind offspring?

A.) Unaffected father and unaffected (non-carrier) mother
B.) Unaffected father and carrier mother
C.) Affected father and carrier mother
D.) Affected father and unaffected (non-carrier) mother

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Аноним Аноним · Answer 1 · 2016-07-28T05:24:28+02:00

The answer is letter C.) Affected father and carrier mother

"Affected" refers to the person having the recessive gene of the color blindness, while "carrier" means the person carries two of the recessive genes of the trait. For the couple to produce a 1:1 ratio of normal to color-blind offspring, they would need to have the combination of affected father and carrier mother.

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