The given diagram represents the 23rd pair of sex chromosomes of a couple:
Correct answer: B. Option B
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
A son must have the genotype XY, with X being inherited from mother and Y from father. Option B correctly represents it. A,C and D are incorrect.
Last updated
About X-linked Recessive Inheritance
X-linked recessive inheritance involves genes on the X chromosome, so males express a recessive allele with no corresponding allele on their single X chromosome, while females may be carriers. Pedigrees cover haemophilia and red-green colour blindness, including carrier mothers, affected sons and the absence of father-to-son transmission.
Practise Inheritance
1,238 free Inheritance MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A baby girl is born with hemophilia, which is an X-linked recessive disorder. What are the most likely genotypes of her parents?
A carrier of an X-linked recessive disorder is
A colour blind girl can be born only if
A condition that renders the individual less able to form blood clots is:
A man has hemophilia. Which statement correctly describes the inheritance of this gene?