(D) Let the colour-blind man be $X^cY$ and the daughter of a colour-blind person be $X^cX$ (carrier).When they marry,the cross is $X^cY \times X^cX$.T

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Half of their sons are colour-blind

(D) Let the colour-blind man be $X^cY$ and the daughter of a colour-blind person be $X^cX$ (carrier).When they marry,the cross is $X^cY \times X^cX$.The possible genotypes of the offspring are $X^cX^c$ (colour-blind daughter),$X^cX$ (carrier daughter),$X^cY$ (colour-blind son),and $XY$ (normal son).Thus,half of their sons will be colour-blind.

Class 12 Biology Principles of Inheritance and Variation Pedigree Analysis and Mendelian disorders

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

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A
None of their daughters are colour-blind
B
All the sons are colour-blind
C
All the daughters are colour-blind
D
Half of their sons are colour-blind

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Chapter

Principles of Inheritance and Variation

Subtopic

Pedigree Analysis and Mendelian disorders

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Testing for $\beta$-thalassemia should be done before marriage.

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If a colorblind man marries a woman with normal vision,what is the probability of their son being colorblind?

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Match the columns:

Column $I$ Column $II$

$(a)$ Sickle cell anaemia $(x)$ Homogentisic acid

$(b)$ Alkaptonuria $(y)$ Melanin pigments are absent

$(c)$ Albinism $(z)$ More amount of phenylalanine

$(d)$ Phenylketonuria $(w)$ Defective haemoglobin

Column $I$	Column $II$
$(a)$ Sickle cell anaemia	$(x)$ Homogentisic acid
$(b)$ Alkaptonuria	$(y)$ Melanin pigments are absent
$(c)$ Albinism	$(z)$ More amount of phenylalanine
$(d)$ Phenylketonuria	$(w)$ Defective haemoglobin

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

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$A$ couple,both carriers for the gene of sickle cell anaemia,are planning to get married. What are the chances of them having an anaemic child (in $\%$)?

Mendelian disorders may be of which type?

Testing for $\beta$-thalassemia should be done before marriage.

If a colorblind man marries a woman with normal vision,what is the probability of their son being colorblind?

Match the columns: Column $I$ Column $II$ $(a)$ Sickle cell anaemia $(x)$ Homogentisic acid $(b)$ Alkaptonuria $(y)$ Melanin pigments are absent $(c)$ Albinism $(z)$ More amount of phenylalanine $(d)$ Phenylketonuria $(w)$ Defective haemoglobin

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Match the columns:

Column $I$ Column $II$

$(a)$ Sickle cell anaemia $(x)$ Homogentisic acid

$(b)$ Alkaptonuria $(y)$ Melanin pigments are absent

$(c)$ Albinism $(z)$ More amount of phenylalanine

$(d)$ Phenylketonuria $(w)$ Defective haemoglobin