SCIENTIFIC THINKING The breakthrough that led Bateson and Punnett...

Question

SCIENTIFIC THINKING The breakthrough that led Bateson and Punnett to recognize the existence of linked genes was the appearance of unexpected results after they crossed double heterozygous pea plants (PpLl) with each other. Imagine that you have a group of Labrador retrievers that are all heterozygous for both coat color and blindness (BbNn). If you used this group of dogs to produce 160 puppies, how many puppies of each phenotype do you expect to get if the genes are not linked? How would the results differ if the genes are in fact linked?

Accepted Answer

Hello everyone and welcome to today's video. So what could have happened with the great value if breeding a dominant white sheep which has her home? A cycles dominant genotype and a homo cycles recessive gray sheep yell and a white phenotype offspring. Remember that here we're mixing this homo cycles recessive and this homo cycles dominant phenotype and the result is a result that is the same phenotype as the homo cycles dominant genotype. Well let's just visualize what this crossing is going to look like by creating a punnett square. Here we have the homo cycles dominant and here we have the homo cycles recessive. As we can see. We're going to get all hetero sickos organisms inner F one generation. So the homocide is recessive or just the gray ah leo is still present in every single one of the organisms. However all of them are white. So why is this? Although we have the gray genotype all of them or white. Well the reason for this is that the gray genotype is recessive. So when it is in combination with the dominant, why phenotype or why genotype is going to be massed by this dominant white genotype. So that is the reason where we're not seeing this great leo have a phenotype in the F one population. So the correct answer choice is So the reason why we're only seeing this y phenotype of spring is because the great phenotype is being masked by the dominant white Julio. I really hope this video helped you and I hope to see you on the next one

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