Answer:
Two reasons are that the grasses they ate disappeared which caused some to die, but some lived and ate from trees and reproduction and such happened.
Explanation:
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For a heterozygote, the production of the protein by the DOMINANT allele compensates for the production of a non-functional protein by the RECESSIVE allele. It is classical genetics.
<h3>Alleles and dominance</h3>
An allele is a gene variant, diploid individuals inherit two different alleles for a given gene locus.
A homo-zygous individual has the same alleles, whereas a heterozygous individual has two different alleles for a given gene locus.
Dominance occurs when the dominant allele completely masks the expression of the recessive allele.
Learn more about alleles here:
brainly.com/question/3452155