17.4 A certain species has 42 chromosomes in its muscle cells. Give the number of
chromosomes in each:
(a) of all sperm
(b) of its skin cells
© ova of its female counterpart

In this species, all sperm cells contain half the number of chromosomes found in muscle cells, which means they have 21 chromosomes each.

On the other hand, skin cells are somatic cells, just like muscle cells, and they share the same chromosome number, so skin cells also have 42 chromosomes. Meanwhile, the ova of the female counterpart will also have 21 chromosomes, just like the sperm, as they are both the haploid gametes of this species.