In our society women are blamed for producing female children. Choose the correct answer for the sex determination in humans.
Correct answer: B. Due to the genetic makeup of the particular sperm that fertilizes the egg
- A. Due to a condition like aspermia in the man
- B. Due to the genetic makeup of the particular sperm that fertilizes the egg
- C. Due to the genetic makeup of the egg
- D. Due to a defect in the woman
Explanation
In humans, sex determination is based on the combination of sex chromosomes at fertilization. A female is XX, and a male is XY. The egg always contributes an X chromosome, while the sperm can contribute either an X or a Y chromosome, resulting in female (XX) or male (XY) offspring. Therefore, the sex of the child is determined by the genetic makeup of the sperm, not the egg. Aspermia and defects in women do not impact this genetic determination process.
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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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