Question

How many autosomes will be present in a sexually reproducing organism with the chromosome number 2n=18?

• A. 17
• B. 16
• C. 18
• D. 15

Answer 1

Answer:

B. 16

-As the germ cells contain 2n chromosomes, it is a diploid cell. -It goes through meiosis to develop from a gamete with half as many chromosomes. -The chromosome is divided into two categories: autosomes and allosomes, which are sex chromosomes. -Since, meiosis occurs in the production of ovum, chromosomes divide into exact half, thus there will be 8 autosomes and 1 sex chromosome. -Therefore, it contains 2 sex chromosomes and 16 autosomes in total. Hence, 16 is the number of the autosomes of this species