Respuesta :
The expected ratio of phenotypes of the offspring following the cross of two heterozygotes is 3:1. This is because, in a population with complete dominance, there are three possible genotypes (AA, Aa, and aa) and one possible phenotype (A). Thus, the expected ratio of phenotypes is 3:1.
Assuming complete dominance, the expected ratio of phenotypes of the offspring following the cross of two heterozygotes would be 3:1. This is because there are two possible genotypes for the offspring, either AA or Aa. The Aa genotype would result in the heterozygous phenotype, while the AA genotype would result in the homozygous dominant phenotype. Therefore, out of four possible offspring, three would be heterozygous and one would be homozygous dominant. Therefore, the heterozygous genotype is expected to occur in 75% of the offspring, while the two homozygous genotypes are each expected to occur in 25% of the offspring.
By definition of complete dominance, each parent would contribute one allele to their offspring, and each offspring would inherit two alleles, one from each parent. Of those two alleles, only the allele that is dominant would be expressed in the phenotype. Therefore, for every four alleles that are inherited (two from each parent), only three would be expressed in the phenotype (one from each parent, plus the dominant allele).
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