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A woman with albinic father marries an a...

A woman with albinic father marries an albinic man. The proportion of her progeny is

A

2 normal : 1 albinic

B

all normal

C

all albinic

D

1 normal : 1 albinic

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem of determining the proportion of progeny from a woman with an albinic father who marries an albinic man, we can follow these steps: ### Step 1: Understand the Genetics of Albinism Albinism is an autosomal recessive disorder, which means that an individual must inherit two copies of the recessive allele (let's denote it as 'a') to express the trait. The normal allele is denoted as 'A'. ### Step 2: Determine the Genotype of the Parents - The woman has an albinic father, which means her father is homozygous recessive (aa). Since her mother is normal, the woman must be heterozygous (Aa) because she inherited one normal allele (A) from her mother and one recessive allele (a) from her father. - The albinic man is also homozygous recessive (aa). ### Step 3: Set Up the Punnett Square Now we can set up a Punnett square to determine the possible genotypes of their offspring. | | a | a | |------|----|----| | **A** | Aa | Aa | | **a** | aa | aa | ### Step 4: Analyze the Results From the Punnett square, we can see the following genotypes for the progeny: - 2 offspring with genotype Aa (normal phenotype) - 2 offspring with genotype aa (albinic phenotype) ### Step 5: Calculate the Proportions The total number of progeny is 4, with: - 2 normal (Aa) - 2 albinic (aa) Thus, the proportion of normal to albinic offspring is: - Normal: 2/4 = 50% - Albinic: 2/4 = 50% ### Conclusion The proportion of the progeny is 1 normal : 1 albinic, or in simpler terms, 50% normal and 50% albinic. ### Final Answer The proportion of her progeny is 1:1 (normal to albinic). ---
To solve the problem of determining the proportion of progeny from a woman with an albinic father who marries an albinic man, we can follow these steps: ### Step 1: Understand the Genetics of Albinism Albinism is an autosomal recessive disorder, which means that an individual must inherit two copies of the recessive allele (let's denote it as 'a') to express the trait. The normal allele is denoted as 'A'. ### Step 2: Determine the Genotype of the Parents - The woman has an albinic father, which means her father is homozygous recessive (aa). Since her mother is normal, the woman must be heterozygous (Aa) because she inherited one normal allele (A) from her mother and one recessive allele (a) from her father. - The albinic man is also homozygous recessive (aa). ...
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