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
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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