A family of five daughters is expecting another delivery. The chance of its beings a son is?
Correct answer: C. 50%
- A. Zero
- B. 25%
- C. 50%
- D. 100%
Explanation
The chances of a baby being either boy or girl are always 50% because in human beings there are 22 pairs of autosomes and one pair of sex chromosomes. The female is homozygous while the male is heterozygous and genetically responsible for the sex of the child. Sperms are of two types, i.e. sperms have an X-chromosome which leads to a girl being born, and sperms have a Y-chromosome which is responsible for a boy being born. So, the correct answer is '50%'.
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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.
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