Like humans, all animals pass on genetic material to their offspring through gametes. Dogs have 78 chromosomes in their normal body cells. a State how many chromosomes would be present in a dog sperm cell. b State how many chromosomes would be present in a fertilised dog egg cell.
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The correct option is a) 39, 78
Explanation:
- A normal somatic cells of the body of an organism will have the same number of chromosomes as the parent cell.
- The sex cells will have half the number of chromosomes to maintain the number of chromosomes at the time of fertilization.
- Hence, the egg and the sperm cells have half the number of chromosomes as the somatic cell.
- So, the number of chromosomes in a dog sperm cell will be half of 78 which is 39.
- After fertilization, the 39 chromosomes from the sperm cell and the 39 chromosomes from the egg cell will unite to make 78 chromosomes.
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