A color-blind man marries a woman with normal | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) Color blindness is an $X$-linked recessive trait. Let $X^c$ represent the color-blind allele and $X$ represent the normal allele.$1$. The man is c

Vedclass · Accepted Answer

$0.25$

Vedclass · Answer

(C) Color blindness is an $X$-linked recessive trait. Let $X^c$ represent the color-blind allele and $X$ represent the normal allele.$1$. The man is color-blind $(X^c Y)$. The woman is normal and has no family history,so she is homozygous normal $(XX)$.$2$. Their offspring: The daughter receives $X^c$ from her father and $X$ from her mother,making her a carrier $(X X^c)$. The son receives $Y$ from his father and $X$ from his mother,making him normal $(XY)$.$3$. The daughter (carrier $X X^c$) marries a normal man $(XY)$.$4$. Their children's genotypes: $XX$ (normal daughter),$X X^c$ (carrier daughter),$XY$ (normal son),$X^c Y$ (color-blind son).$5$. The probability of a grandson being color-blind is $0.5$ (since $X^c Y$ is one of two possibilities for a son),and the probability of a granddaughter being color-blind is $0$ (since she must inherit $X^c$ from her father,who is normal). $6$. The question asks for the probability of the daughter's children being color-blind. Since the daughter has a $1/4$ chance of having a color-blind son and $0$ chance of a color-blind daughter,the overall probability for any child is $0.25$.

Column $I$	Column $II$
$(1)$ Albinism	$(q)$ Recessive gene represented by $cc$
$(2)$ Phenylketonuria	$(s)$ Recessive gene represented by $pp$
$(3)$ Sickle cell anaemia	$(p)$ Recessive gene represented by $Hb^sHb^s$
$(4)$ Alkaptonuria	$(r)$ Recessive gene represented by $aa$

$A$ color-blind man marries a woman with normal vision,whose family has no history of color blindness. What is the probability that their daughter's children (grandsons and granddaughters) will be color-blind?

Similar Questions

Match the columns:

Column $I$ Column $II$

$(1)$ Albinism $(q)$ Recessive gene represented by $cc$

$(2)$ Phenylketonuria $(s)$ Recessive gene represented by $pp$

$(3)$ Sickle cell anaemia $(p)$ Recessive gene represented by $Hb^sHb^s$

$(4)$ Alkaptonuria $(r)$ Recessive gene represented by $aa$

Sickle-cell anaemia happens due to $A$ mutation in which $B$ of haemoglobin is affected. Fill the correct option for $A$ and $B$.

Hemophilia is more common in human males than in females because it is a:

Which of the following disorders is an autosomal recessive disorder?

Which of the following is a genetic disease?

Vedclass Test Series

Exam Paper Generator

Online Exam Module