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A colourblind mother and normal father w...

A colourblind mother and normal father would have

A

colour blind sons and normal/carrier daughters

B

colour blind sons and daughters

C

all colour blind

D

all normal

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the offspring of a colorblind mother and a normal father, we will follow these steps: ### Step 1: Understand the Genetics of Colorblindness Colorblindness is a recessive sex-linked disorder, which means the gene responsible for colorblindness is located on the X chromosome. The normal vision allele is dominant (let's denote it as X^N), while the colorblind allele is recessive (denote it as X^c). ### Step 2: Determine the Genotypes of the Parents - The mother is colorblind, which means she has two copies of the colorblind allele (X^c X^c). - The father has normal vision, which means he has one normal vision allele and one Y chromosome (X^N Y). ### Step 3: Determine the Gametes Produced by Each Parent - The mother can only produce gametes with the X^c allele (X^c). - The father can produce two types of gametes: one with the X^N allele and one with the Y chromosome (X^N and Y). ### Step 4: Create a Punnett Square Now, we will create a Punnett square to determine the possible offspring: | | X^N | Y | |---------|---------|---------| | X^c | X^c X^N | X^c Y | | X^c | X^c X^N | X^c Y | ### Step 5: Analyze the Results From the Punnett square, we can see the possible genotypes of the offspring: - 50% will be female (X^c X^N) - these daughters are carriers of the colorblind allele but do not express the trait. - 50% will be male (X^c Y) - these sons will be colorblind. ### Conclusion The offspring of a colorblind mother and a normal father will have: - Colorblind sons (X^c Y) - Normal carrier daughters (X^c X^N) ### Final Answer The correct answer is that the couple would have colorblind sons and normal carrier daughters. ---
To solve the question regarding the offspring of a colorblind mother and a normal father, we will follow these steps: ### Step 1: Understand the Genetics of Colorblindness Colorblindness is a recessive sex-linked disorder, which means the gene responsible for colorblindness is located on the X chromosome. The normal vision allele is dominant (let's denote it as X^N), while the colorblind allele is recessive (denote it as X^c). ### Step 2: Determine the Genotypes of the Parents - The mother is colorblind, which means she has two copies of the colorblind allele (X^c X^c). - The father has normal vision, which means he has one normal vision allele and one Y chromosome (X^N Y). ...
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