, 30.11.2020allytrujillo20oy0dib

# If an adult dog has 78 chromosomes, the number of chromosomes in a dog’s sperm cell will be .

39

Explanation:

the sperm cell always has half of the chromosomes

There's 39 chromosomes in the sperm cell. Why? Because sperm cells are gametes and therefore they are haploid cells meaning they have half the number of chromosomes of a regular cell or diploid cell.

78 / 2 = 39
Dogs have 79 chromsomes so the sperm would only have half of the so 39

they are haploid cells meaning they have half the number of chromosomes of a regular cell or diploid cell.

78 / 2 = 39

48 bro is common knowledge

39

Reproductive cells are haploid (have 1/2 the chromosomes), whereas somatic/body cells are diploid (have the full set of chromosomes)

This makes sense if you think about it. Using the example from the question, every dog has 78 chromosomes. This includes two of each (there are two chromosome 1's, two chromosome 2's, etc. This is visible in the karyotype attached). One set of these chromosomes were inherited from the mother, and one set from the father. Each parent contributed 39 chromosomes (one chromosome 1, one chromosome 2, etc.). If the dog in the question were to have 78 chromosomes in its sperm cells, it would contribute two sets to its offspring. When combined with the chromosomes in the egg cell, the offspring would end up with extra chromosomes. Therefore, both the sperm and the egg cells will have 39 chromosomes, one of each. When combined, they will produce offspring with 78 chromosomes, the proper number.

39 is the answer because sperm is half number of somatic cells

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