The number of autosomes in a normal human sperm cell is: MCQ with Answer and Explanation

The number of autosomes in a normal human sperm cell is:
A. 44
B. 23
C. 46
D. 22
Answer: Option D
Solution (By JKExamLibrary)
Human somatic cells have 46 chromosomes: 44 autosomes and 2 sex chromosomes (XX or XY). Sperm cells are haploid (n=23), containing 22 autosomes and one sex chromosome (either X or Y). The ovum also has 22 autosomes and one X. Fertilization restores 44 autosomes plus XX or XY. So sperm has 22 autosomes.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1
Glycogen is a polysaccharide primarily stored in:
A. Fungal cell walls
B. Animal liver and muscle cells
C. Plant cells
D. Bacterial cell membranes

Correct Answer: Option B


Explanation:
Glycogen is a highly branched polysaccharide of glucose, often referred to as 'animal starch'. It is the primary storage form of carbohydrates in animals and fungi. It is mainly stored in the liver and muscle cells. When blood glucose levels drop, glycogen is broken down (glycogenolysis) to release glucose for energy.

This question belongs to: Science Biology
Question #2
The placenta secretes several hormones essential for maintaining pregnancy. Which of the following is NOT primarily secreted by the placenta?
A. Prolactin
B. Human Placental Lactogen (hPL)
C. Human Chorionic Gonadotropin (hCG)
D. Progesterone

Correct Answer: Option A


Explanation:
The placenta acts as a temporary endocrine gland, secreting hCG (which maintains the corpus luteum), hPL (which alters maternal metabolism for fetal growth), and high levels of estrogen and progesterone (which maintain the uterine lining and suppress further ovulation). Prolactin, however, is primarily secreted by the anterior pituitary gland, although its levels rise significantly during pregnancy to prepare the mammary glands for lactation.

This question belongs to: Science Biology
Question #3
Which of the following statements about genes and alleles is correct?
A. An individual with two identical alleles is heterozygous.
B. Recessive alleles are always expressed in the phenotype.
C. A gene is a variant form of an allele.
D. Dominant alleles mask the effect of recessive alleles.

Correct Answer: Option D


Explanation:
Dominant alleles express their trait when present, masking recessive alleles. A gene is a DNA segment; alleles are its variants. Homozygous means identical alleles, recessive expressed only in homozygous state.

This question belongs to: Science Biology