Answer :
Answer: A
Explanation:
Reproductive cells are haploid, meaning that there's only one copy of each chromosome. Somatic cells are diploid so there's 2 copies of each chromosomes.
if n = 18, then 2n = 36 so A is the answer
If an organism has 18 chromosomes in its reproductive cells, then the organism will have 17 autosomal homologous pairs in its somatic cell.
- Diploid organisms have two set of chromosomes in their genome. During sexual reproduction, gametes are produced via meiosis. These gametes are haploid (n) in nature.
- The haploid gametes or reproductive cells contain half of the number of chromosomes in the somatic or body cell.
- However, in a sexually reproducing organism, a pair of chromosome out of the whole number of chromosomes is referred to as sex chromosomes. In humans, there are 23 pairs of chromosomes in somatic cell, however, only 22 pairs are autosomes while 1 pair is sex chromosomes (X and Y).
- In this case, if an organism has 18 chromosomes in its reproductive cell, it means that organism has 18 pair of chromosomes in its somatic cell. However, only 17 pairs will be autosomal while a pair will be sex chromosomes.
- Therefore, if an organism has 18 chromosomes in its reproductive cells, then the organism will have 17 autosomal homologous pairs in its somatic cell.
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