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Suppose T is dominant to t. T confers tall plant height. In a cross between a parent of unknown genotype and a Tt individual, 50% of the progeny are tall. What is the genotype of the unknown parent?

a. TT

b. Tt

c. impossible to tell

d. tt

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Related questions

Consider two genes in a large, randomly mating population of turtles with no movement of individuals in and out of the population and no mutation. The two alleles at one gene, L and M, do not affect fitness. The two alleles at the other gene, T and t, do affect fitness -- they affect the thickness of turtle shells, and the degree to which they are protected from predation. TT individuals have thick shells, which repel predators, and survive best. Tt individuals have medium shell thickness and survive 88% as well as do TT individuals. tt individuals have thin shells and are easy for predators to eat; they survive only 14% as well as do TT individuals.

a) In a population of ADULT turtles, the frequency of individuals with the MM genotype is 0.06. (Calculate the frequency of individuals with the LM genotype. )

b) In a population of gametes at the start of a generation, the frequency of the t allele is 0.23. (Calculate the frequency of zygotes with the Tt genotype.)

c) Continuing from part (b), calculate the frequency of the adults that survive from the zygotes that have the Tt genotype.

d) Continuing from part (c), calculate the frequency of the t allele in the gametes that will produce the next generation.

Consider two genes in a large, randomly mating population of turtles with no movement of individuals in and out of the population and no mutation. The two alleles at one gene, L and M, do not affect fitness. The two alleles at the other gene, T and t, do affect fitness -- they affect the thickness of turtle shells, and the degree to which they are protected from predation. TT individuals have thick shells, which repel predators, and survive best. Tt individuals have medium shell thickness and survive 88% as well as do TT individuals. tt individuals have thin shells and are easy for predators to eat; they survive only 14% as well as do TT individuals.

a) In a population of ADULT turtles, the frequency of individuals with the MM genotype is 0.06. Calculate the frequency of individuals with the LM genotype.

b) In a population of gametes at the start of a generation, the frequency of the t allele is 0.23. Calculate the frequency of zygotes with the Tt genotype.

c) Continuing from part (b), calculate the frequency of the adults that survive from the zygotes that have the Tt genotype.

d) Continuing from part (c), calculate the frequency of the t allele in the gametes that will produce the next generation.

Suppose you perform a monohybrid cross of two pea plants. The plants are heterozygous at the locus for stem height. T is dominant to t. T confers tall plant height. When you count the progeny, you find that there are 188 tall plants and 62 short plants. Does this approximate the 3:1 phenotypic ratio caused by Mendelian inheritance?

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