Three strains of green-seeded lentil plants appear to ha...

Question

Three strains of green-seeded lentil plants appear to have the same phenotype. The strains are designated G₁, G₂, and G₃. Each green-seeded strain is crossed to a pure-breeding yellow-seeded strain designated Y. The F₁ of each cross are yellow; however, self-fertilization of F₁ plants produces F₂ with different proportions of yellow- and green-seeded plants as shown below.

Using the allele symbols A and a, B and b, and D and d to represent alleles at segregating genes, give the genotypes of parental and F₁ plants in each cross.

Accepted Answer

Hi, everyone. Here's our next question. It says, suppose a tall plant that has a homogeneous, dominant genotype is crossed with the short variant. What is the genotype of the offspring? Well, we're told that tall is our dominant trait and that our particular tall plant is homos, I guess dominant. So we'll call that big T for the, for the tall treat. So we know that our tall plant must be big t big T since we know that tall is a dominant trait, if the other parent here is short, we know it must be homos, I guess recessive to express that trait in a typically. So it's genotype must be little T, little T. So we have this cross, each plant can only have one type of gamete, the tall plant, the big gamut, the small plant, or the short plant, the little T gamut. And therefore all the offspring will be hetero, I guess big T little T. So when we look at our answer choices, we see that choice C is hetero zegas and we can eliminate choice. A homicide is dominant against. They inherit one of each type of value from both parents. Choice be homesick is recessive. It's not our answer and choice. The Hemmens, I guess refers to the situation when an individual has only one chromosome of a pair. So for instance, a male would be Hamas, I guess for a trait that's excellent since the male only has the one X chromosome, but that's not what we're describing here. So it's not the end, not our answer. So again, if a tall plant that is home is dominant is crossed with the short variant, what is the genotype of the offspring choice? C hetero zegas? See you in the next video.

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