A geneticist crosses a pure-breeding strain of peas prod...

Question

A geneticist crosses a pure-breeding strain of peas producing yellow, wrinkled seeds with one that is pure-breeding for green, round seeds

What proportion of the F₂ progeny are expected to have yellow seeds? Wrinkled seeds? Green seeds? Round seeds?

Accepted Answer

Hello, everyone and welcome to today's video. So if we cross to heterosexuals, parents with the same gina types as given here, what is the probability of producing progeny that has dominant phenotype is for all three traits? But remember that dominant phenotype are going to be yielded by either hetero zegas individuals or homo zegas dominant individuals. Either one can yield these dominant phenotype. Now. And here we have a very powerful shortcut to solve these type of problems. We know that they have the same genotype as given here. This genotype is going to be made up by all hetero zegas gina types for all three genes. Now, if we cross the hetero Zegas Beijing with the Hetero Zegas Beijing, we're going to obtain the same probability of obtaining these dominant phenotype as if we do it for C or D because they all have the same genotype that all hetero zegas. So let's see what we mean by this we have upon it square and we're going to use it to solve for the probability of dominant phenotype for the Beijing. And here we have it, We can see that three out of four of these offspring are going to have the dominant phenotype. Now, if we did the same thing for C and four D, we would still be getting three out of four And three out of four because there's still hetero Zegas, it is basically the same cross that we're making. So all we have to do really is multiply these three probabilities in order to obtain the total probability of having these dominant phenotype. And this is going to be 27 Out of 64, which is going to be represented by answer choice. I really hope this video helped you and I hope to see you on the next one.

A geneticist crosses a pure-breeding strain of peas producing yellow, wrinkled seeds with one that is pure-breeding for green, round seeds

What proportion of the F₂ progeny are expected to have yellow seeds? Wrinkled seeds? Green seeds? Round seeds?

Key Concepts

Mendelian Genetics

Punnett Square

Phenotypic Ratios

Watch next

A geneticist crosses a pure-breeding strain of peas producing yellow, wrinkled seeds with one that is pure-breeding for green, round seedsWhat proportion of the F₂ progeny are expected to have yellow seeds? Wrinkled seeds? Green seeds? Round seeds?

Key Concepts

Mendelian Genetics

Punnett Square

Phenotypic Ratios

Watch next

A geneticist crosses a pure-breeding strain of peas producing yellow, wrinkled seeds with one that is pure-breeding for green, round seeds

What proportion of the F₂ progeny are expected to have yellow seeds? Wrinkled seeds? Green seeds? Round seeds?