Joel is comparing two slides showing chromosomes in a sperm cell and a skin cell of a dog. he finds that the sperm cell has 39 chromosomes. how many chromosomes can he expect in the skin cell

The total number of chromosome in a skin cell is equal to 78

Explanation:

The sperm is usually haploid i.e it will contains only half of the total chromosome number.

Therefore , if the total number of chromosomes is "n" , then the number of chromosome in the sex cell will be "n/2"

Thus, 39 chromosome is just the half of total chromosome number.

Now a skin cell is a diploid cell and it will contain all the chromosome i.e "n"

As we know

Hence, the total number of chromosome in a skin cell is equal to 78

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.