QUESTION 8 The following pedigree follows a trait found in the Jones family. Wha
ID: 132359 • Letter: Q
Question
QUESTION 8
The following pedigree follows a trait found in the Jones family.
What type of inheritance is most likely for this trait?
X-linked dominant
autosomal recessive
X-linked recessive
autosomal dominant
2 points
QUESTION 9
(1 mark)
What is the genotype of individual I-1 based on the pedigree shown in Question 8 for the Jones family?
XAXA
XAXa
XaXa
AA
Aa
aa
1 points
QUESTION 10
(1 mark)
What is the genotype of individual I-2 based on the pedigree shown in Question 8 for the Jones family?
XAY
XaY
AA
Aa
aa
1 points
QUESTION 11
(1 mark)
What is the genotype of individual II-5 based on the pedigree shown in Question 8 for the Jones family?
XAXA
XAXa
XaXa
AA
Aa
aa
QUESTION 12
What is the genotype of individual IV-4 based on the pedigree shown in Question 8 for the Jones family?
XAY
XaY
AA
Aa
aa
Please look here if the above pedigree link is not opening.
X-linked dominant
autosomal recessive
X-linked recessive
autosomal dominant
2 2 3 4 2 3 5 IV 2 3 4Explanation / Answer
Please find the answers below:
Answer 8: Choice 3 (Since the affected father carrying a single X-chromosome distributed the disease to the future generations, with a few males and females affected, the disease is inherited in X-linked recessive manner)
Answer 9: Choice 2 (XAXa: Since the disease is inherited in X-linked recessive manner, the female offsprings can be affected only if they carry two alleles for the disease. One allele comes clearly from the father and thus the other must come from the heterozygous mother)
Answer 10: Choice 2 (XaY: Since the disease is X-linked recessive in nature, the only possible genotype for the father is XaY)
Answer 11: Choice 3 (XaXa: Since the daughter can be affected only when she carries both the recessive alleles, she must be homozygous for the recessive trait)
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