Question
Hemophilla is a condition in which minor cuts and brukes can result in prolonged bleeding. Hemophilia is caused by a recessive allele for a sex-linked gene. If a man who does not have hemophilla has a son with a woman who is a carrier for hemophilia,what are the chances that their son will have hemophilia? on 25% 50% 100x
Answer
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Ashton
Elite · Tutor for 8 years
Answer
### 50%
Explanation
## Step 1: Identify the inheritance pattern### Hemophilia is a recessive sex-linked trait, often carried on the X chromosome.## Step 2: Analyze the genetic cross### The mother is a carrier (X\textsuperscript{H}X\textsuperscript{h}), and the father does not have hemophilia (X\textsuperscript{H}Y). Therefore, the mother's genes are X\textsuperscript{H} and X\textsuperscript{h}, while the father's genes are X\textsuperscript{H} and Y.## Step 3: Determine the genotype of their son### A son inherits the Y chromosome from his father and one X chromosome from his mother. Here, the X chromosome from the mother can either be X\textsuperscript{H} or X\textsuperscript{h}.## Step 4: Calculate the chance of hemophilia in the son### The son has a 50% chance of inheriting X\textsuperscript{H}Y (no hemophilia) and a 50% chance of inheriting X\textsuperscript{h}Y (hemophilia).