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1. Which statement about human chromosomes is NOT correct? a. A complete set of human chromosomes...

1. Which statement about human chromosomes is NOT correct?

a. A complete set of human chromosomes typically has 22 pairs of autosomal chromosomes and 1 pair of sex chromosomes.

b. A human gamete carries 23 chromosomes, one from each homologous pair.

c. One member of each homologous pair of chromosomes is maternal in origin, and the other is paternal in origin.

d. When a sperm fertilizes an egg, the number of chromosomes is restored to a total of 46.

e. Each member of a homologous pair of chromosomes will have completely different genes at different loci.

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Answer #1

Question 1

Answer: In human beings, each cell consists of 23 pair of chromosomes of which 22 pairs are autosomes and 1 pair is allosomes. Hence, option a is the correct statement about human chromosomes and is an incorrect option.

During gamete formation, meiosis occurs in the gamete cells that leads to reduction of chromosomes to half of the parents. Hence, gametes will have 23 chromosomes, one from each pair. Hence, option b is the correct statement about human chromosomes and is an incorrect option.

During fertilization of sperm with egg, one member of homologous pair of chromosomes of maternal origin pair with other member of parental origin. This restore the chromosomes number to 23 pairs (46 chromosomes). Hence, option c and d are the correct statement about human chromosomes and is an incorrect option.

Each member of homologous chromosomes will have same genes at same loci. Hence, option e is not the correct statement about human chromosomes and is the correct option.

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