Albinism is caused by an autosomal recessive | vedclass

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(B) Albinism is an autosomal recessive disorder. Let the normal allele be '$A$' and the albino allele be '$a$'.Since the first child is an albino $(aa

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$25$

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(B) Albinism is an autosomal recessive disorder. Let the normal allele be '$A$' and the albino allele be '$a$'.Since the first child is an albino $(aa)$,both parents must be carriers of the recessive allele $(Aa)$.When two carrier parents $(Aa 	imes Aa)$ have a child,the possible genotypes are $AA, Aa, Aa, aa$.The probability of an offspring being an albino $(aa)$ is $1/4$ or $25\%$.Each child's birth is an independent event,so the probability for the second child remains $25\%$.

Albinism is caused by an autosomal recessive disorder. $A$ couple has their first child who is an albino (having abnormal skin pigmentation). What is the probability that their second child will also be an albino (in $\%$)?

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All sons of a couple are colourblind because

$A$ woman has normal vision but some of her sons and daughters are colorblind. What are the genotypes of the woman and her husband?
$(A)$ Woman: $X^C X^C$, Husband: $X^c Y$
$(B)$ Woman: $X^C X^c$, Husband: $X^c Y$
$(C)$ Woman: $X^C X^c$, Husband: $X^C Y$
$(D)$ Woman: $X^c X^c$, Husband: $X^C Y$

$A$ - Sickle-cell anaemia is a sex-linked recessive trait.
$R$ - This disease is controlled by more than two pairs of alleles.

Which of the following is associated with sex-linked inheritance?

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