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A normal woman is married to a colour bl...

A normal woman is married to a colour blind man.The children are expected to be

A

All normal

B

50% sons are colour blind

C

All doughters are normal but carrier whereaas all sons are normal phenothypuically as well as genotypically

D

50% daughters are colour blind

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem of what children are expected from a normal woman married to a colorblind man, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Genetic Background**: - Color blindness is an X-linked recessive disorder. This means that the gene responsible for color blindness is located on the X chromosome, and males (XY) are more likely to be affected because they have only one X chromosome. 2. **Determine the Genotypes**: - The colorblind man has the genotype XcY, where Xc represents the X chromosome with the colorblind allele. - The normal woman can either be homozygous normal (XX) or a carrier (XcX). Since the problem states she is normal, we will assume she is homozygous normal (XX) for this solution. 3. **Gamete Formation**: - The normal woman (XX) can produce two types of gametes: X and X. - The colorblind man (XcY) can produce two types of gametes: Xc and Y. 4. **Punnett Square Analysis**: - We can set up a Punnett square to visualize the possible combinations of gametes from the parents: ``` Xc Y ------------ X | XcX | XY | ------------ X | XcX | XY | ``` - From the Punnett square, we can see the possible offspring: - XcX (female, carrier for color blindness) - XY (male, normal vision) - XcX (female, carrier for color blindness) - XY (male, normal vision) 5. **Analyze the Results**: - The results show that: - 50% of the children are females (XcX), who are carriers but not colorblind. - 50% of the children are males (XY), who have normal vision. 6. **Conclusion**: - Therefore, the expected children from a normal woman married to a colorblind man will be: - 50% daughters who are carriers (normal phenotype) - 50% sons who are normal (normal phenotype). ### Final Answer: The children are expected to be: - 50% daughters who are carriers (normal phenotype) - 50% sons who are normal (normal phenotype)
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