Question

a cell biologist produces a karyotype of mouse somatic cells arrested in mitosis. she sees 40 chromosomes, which is completely normal for mice. based on this information, what is the haploid number of chromosomes for mice? multiple choice it cannot be determined from the information provided. 20 10 40 80

Explanation:

Step1: Recall cell - chromosome concept

Somatic cells are diploid. Diploid number ($2n$) of chromosomes in mouse somatic cells is 40.

Step2: Calculate haploid number

The haploid number ($n$) is half of the diploid number. So, $n=\frac{40}{2}$.

Answer:

B. 20