A colour blind man marries daughter of a colour blind person. Then in their progeny

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4.Principles of Inheritance and Variation

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A colour blind man marries the daughter of a colour blind person. Then in their progeny

None of their daughters are colour blind

All the sons are colour blind

All the daughters are colour blind

Half of their sons are colour blind

(AIPMT-1988) (AIIMS-1983)

Solution

(d)Since daughter of a colourblind person will be a carrier of the disease and only one of the two $X$ chromosomes will bear the recessive gene for disease, so half of their sons will be colourblind.

Standard 12

Biology

Colour blindness in man is

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If a colour blind man marries a woman who is homozygous for normal vision, the probability of their son being colour blind is ………

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Following characters are indicate

$(i)$ presence of sickle – shaped $RBC$

$(ii)$ Blood not clot, non stop bleeding

$(iii)$ The heterozygous female transmit the disease to sons.

$(iv)$ Both heterozygous parents transmit the disease to offspring

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Give differences : Haemophilia and Sickle-cell Anaemia

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Recessive characters are expressed

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A colour blind man marries the daughter of a colour blind person. Then in their progeny

Solution

Similar Questions

Colour blindness in man is

If a colour blind man marries a woman who is homozygous for normal vision, the probability of their son being colour blind is ………

Following characters are indicate $(i)$ presence of sickle – shaped $RBC$ $(ii)$ Blood not clot, non stop bleeding $(iii)$ The heterozygous female transmit the disease to sons. $(iv)$ Both heterozygous parents transmit the disease to offspring

Give differences : Haemophilia and Sickle-cell Anaemia

Recessive characters are expressed

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Following characters are indicate

$(i)$ presence of sickle – shaped $RBC$

$(ii)$ Blood not clot, non stop bleeding

$(iii)$ The heterozygous female transmit the disease to sons.

$(iv)$ Both heterozygous parents transmit the disease to offspring