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21) Humans have about 20,000 genes. If each gene had two alleles (not actually true since some have only one and otherfar mor

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Answer #1

Assuming that there is one dominant and one recessive allele in each gene, we have three options of genotype:

Homozygous dominant (AA)

Homozygous recessive (aa)

Heterozygous (Aa)

If one gene can present three different genotypes, we can multiply the total number of genes by 3 possible genotypes

20.000 x 3 = 60.000 different genotypes

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