Sex-linked pedigree chart worksheet focusing on hemophilia inheritance patterns.

Let’s go step by step to figure out the phenotypes for each individual based on their genotypes and the rules of sex-linked inheritance.

We’re told:
- Hemophilia is a recessive disorder on the X chromosome.
- Males have one X and one Y → so if they get the recessive allele (X^h), they will have hemophilia. They can’t be carriers — they either have it or don’t.
- Females have two X chromosomes → they can be:
- Normal: X^H X^H
- Carrier: X^H X^h (has the gene but doesn’t show symptoms)
- Affected: X^h X^h (rare, since needs two copies)

Also, shaded shapes = has the disorder (hemophilia). Unshaded = normal or carrier (for females).

Now let’s look at each question:

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2) Individual 2: genotype is X^H X^h

→ Female (because circle)
→ Has one normal and one recessive allele → she’s a carrier (doesn’t have hemophilia herself)
✔ Answer: Female, carrier

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3) Individual 4: genotype is X^h Y

→ Male (square)
→ Has the recessive allele on his only X → he has hemophilia
✔ Answer: Male, hemophilia

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4) Individual 5: genotype is X^h Y

→ Male (square)
→ Same as above → has hemophilia
✔ Answer: Male, hemophilia

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5) Individual 7: genotype is X^H Y

→ Male (square)
→ Has the dominant normal allele → normal
✔ Answer: Male, normal

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6) Individual 9: genotype is X^H X^h

→ Female (circle)
→ One normal, one recessive → carrier
✔ Answer: Female, carrier

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7) Individual 10: genotype is X^H Y

→ Male (square)
→ Normal allele → normal
✔ Answer: Male, normal

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All answers match what’s already written in the worksheet — we’re just confirming them with reasoning.

Final Answer:
2) Female, carrier
3) Male, hemophilia
4) Male, hemophilia
5) Male, normal
6) Female, carrier
7) Male, normal