A woman whose father was color blind (X-linked, recessive) and who has type A bl

Question

A woman whose father was color blind (X-linked, recessive) and who has type A blood has accused a man who is himself color blind of fathering her child. The accused man has type B blood. For each of the following cases, indicate whether or not the man might be the father. Explain your answer by including the genotype of the child and demonstrating how that genotype could be produced.
a) a color blind son with type O blood
b) a normal visioned son with type O blood
c) a normal visioned son with type AB blood
d) a color blind daughter with type B blood
e) a normal visioned daughter with type A blood

Explanation / Answer

IBIB / IBIO (2 possibilities for blood type B) a) a color blind son with type O blood (XqY and IOIO) Yes, the man can be his father. In this case Genotype for vision
Genotype for blood
Woman XQXq
IAIO
Man XqY
IBIO Genotype for vision
Genotype for blood
Woman XQXq
IAIO
Man XqY
IBIO IBIO b) a normal visioned son with type O blood(XQY and IOIO) Yes, the man can be his father. In this case Genotype for vision
Genotype for blood
Woman XQXq
IAIO
Man XqY
IBIO
Genotype for vision
Genotype for blood
Woman XQXq
IAIO
Man XqY
IBIO
Genotype for vision
Genotype for blood
Woman XQXq
IAIO
Man XqY
IBIO
IBIO
c) a normal visioned son with type AB blood(XQY and IAIB) Yes, the man can be his father. Genotype for vision
Genotype for blood
Woman XQXq
IAIA
Man XqY
IBIB
Genotype for vision
Genotype for blood
Woman XQXq
IAIA
Man XqY
IBIB
IBIB
d) a color blind daughter with type B blood (XqXq and IBIO) Yes, the man can be her father. Genotype for vision
Genotype for blood
Woman XQXq
IAIO
Man XqY
IBIO/IBIB
Genotype for vision
Genotype for blood
Woman XQXq
IAIO
Man XqY
IBIO/IBIB
Genotype for vision
Genotype for blood
Woman XQXq
IAIO
Man XqY
IBIO/IBIB
IBIO/IBIB
e) a normal visioned daughter with type A blood (XQXq and IAIO) Yes, the man can be her father. Genotype for vision
Genotype for blood
Woman XQXq
IAIO /IAIA
Man XqY
IBIO
Yes, the man can be her father. Genotype for vision
Genotype for blood
Woman XQXq
IAIO /IAIA
Man XqY
IBIO
IBIO
For all the cases, you just need to do a cross to justify your answer. Hope this helps! Genotype for vision
Genotype for blood
Woman XQXq (since her father is a colour blind, she must be a carrier)
IAIA / IAIO (2 possibilities for blood type A)
Man XqY (since he is a colour blind)
IBIB / IBIO (2 possibilities for blood type B)

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