In Down's syndrome of a male child, the sex complement is
Correct answer: B. XY
- A. XO
- B. XY
- C. XX
- D. XXY
Explanation
The correct option is b) XY. Down syndrome: also known as trisomy 21, is a genetic disorder caused by the presence of an extra copy of chromosome 21. It typically occurs due to nondisjunction during the formation of reproductive cells.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
Practise Inheritance
1,238 free Inheritance MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Inheritance questions
Tt mates with tt. What will be characteristic of offspring?
ABO blood group system is due to:
In a genetic cross having recessive epistasis, F2 phenotypic ratio would be
Haemophilia is more common in males because it is a
Which one is a hereditary disease?
A normal green male maize is crossed with albino female. The progeny is albino because: