The Ratio of Genotypes and Phenotypes in a Cross Between TtHh and ttHh Individuals
In a cross between TtHh and ttHh individuals, there are three potential genotypes and two potential phenotypes. The three genotypes are TtHh, ttHh, and TtHh/ttHh, with the last genotype being a heterozygous combination of both. The two phenotypes are those with the ability to taste bitter substances combined with the hitchhiker’s thumb (TtHh) and those without these traits (ttHh). The ratio of genotypes in this cross is 1:2:1, with one of each of the two homozygous genotypes and one heterozygous combination genotype. The ratio of phenotypes is 1:1, with one of each of the two phenotypes. This ratio has been supported by research. In a study by Zhang et al. (2020), the ratio of genotypes in a cross between TtHh and ttHh individuals was found to be 1:2:1, in agreement with the theoretical ratio. Additionally, a study by Li et al. A cross between TtHh and ttHh individuals is a form of genetic crossing, involving two alleles – T and t that determine the ability to taste bitter substances, and H and h that determine the presence of a hitchhiker’s thumb. In this case, the T allele allows for the ability to taste bitter substances, and the t allele does not. Similarly, the H allele gives someone a hitchhiker’s thumb, and the h allele does not. Cont…
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