Dogs, like all species, carry many different genes on each of their chromosomes. The chromosomes that are inherited by the puppies do not always carry the same set of alleles for these genes as the original matching chromosomes of their parents. This is a result of

Variation and recessive genes.

Explanation:

Crossing over during meiosis

Explanation: i got this question right lol

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answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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