Question

In humans, the ABO blood type is under the control of autosomal multiple alleles, while color...

In humans, the ABO blood type is under the control of autosomal multiple alleles, while color blindness is a recessive X-linked trait. If two parents who are both type B and have normal vision produce a son who is color blind and is type O, what is the probability that their next child will be a male and has normal vision and is type O? explain your answer

Homework Answers

Answer #1

Based on the information, both are heterozygous for blood type B and female is heterozyogous for colorblindness, male is normal for colorblindness.

XC Xc ; IB i (female) x (male) XC Y; IB i ------------------Parents

XC Xc x XC Y

XC Y
XC XC XC XC Y
Xc XC Xc Xc Y

XCXC (1/4), XC Y (1/4), XC Xc (1/4) & Xc Y (1/4)

IB i x IB i

IB i
IB IB IB IB i
i IB i i i

IB IB (1/4), IB i(1/2) & ii (1/4)

The probability that their next child will be a male and has normal vision and is type O = XCY; ii = ¼ x ¼ = 1/16

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