Answer:
alleles-one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
dominant- The dominant allele of the gene is inherently dominant,so it hides the presence of the recessive allele
heterozygous-having two different alleles of a particular gene or genes.
homozygous-a particular gene that has identical alleles on both homologous chromosomes
recessive-A recessive gene is a gene that can be masked by a dominant gene
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They construct dams and create an ecosystem for other species . Because of their dam building nests become available for birds, fish population increases and waterfowl population goes up