A pure-breeding tall plant producing oval fruit as descr...

Question

A pure-breeding tall plant producing oval fruit as described in Problem 2 is crossed to a pure-breeding short plant producing round fruit.

The F₁ are crossed to short plants producing oval fruit. What are the expected proportions of progeny phenotypes?

Accepted Answer

Welcome back. Here's our next problem. It says in the F one generation, it's heterozygous long plants with round seeds. Big T little tea, big, R, little R are the offspring of crossing long plants with round seeds. Big T, big T big R, big, R with short plants with wrinkle seeds, little tea, little tea, little R, little R. What is the probability that the F1 offspring will have short plants and round seeds if they are crossbred through self pollination? And our answer choices are a 1/16 b 9/16 3, C 3/16  D, none of these. So there is that possibility that none of the answers will be correct. So let's think about our cross here. We know that we have our F one plants which are being self pollinated. So our cross will be heterozygous and both traits. Big T, little T, big, R, little R cross with big T little T big R, little R. And we know that the parents of this F one generation or homozygous dominant and homozygous recessive. And we know from that what the dominant and recessive traits are. We know that big T it's a long plant, little tea, short plant, big R is round seeds and little R is wrinkled seats. Now, when we look at our cross, this is a di hybrid cross. And so we know that our phenotypic ratio of our offspring will be nine, 23 to three to one. And the nine there stands for the plants that will be dominant in both traits. This three will have one dominant trait and one recessive trait. The next three will have one recessive, one dominant. So switched which one is recessive and which is dominant and the one is plants that will be recessive in both traits. So the offspring whose probability we are calculating is offspring with short plants round seeds. Well, short is the little t recessive round is the big r dominant. So we have one recessive trait and one dominant trait. So that would be the three in our phenotypic ratio. The total number of offspring in that ratio is 16. So that means the probability that the F1 offspring will have short plants and round seeds will be 3/16. And that's answer. C you can just highlight that 3/16. See you in the next video.

A pure-breeding tall plant producing oval fruit as described in Problem 2 is crossed to a pure-breeding short plant producing round fruit.

The F₁ are crossed to short plants producing oval fruit. What are the expected proportions of progeny phenotypes?

Key Concepts

Mendelian Genetics

Phenotype and Genotype

Punnett Square

Watch next

A pure-breeding tall plant producing oval fruit as described in Problem 2 is crossed to a pure-breeding short plant producing round fruit.The F₁ are crossed to short plants producing oval fruit. What are the expected proportions of progeny phenotypes?

Key Concepts

Mendelian Genetics

Phenotype and Genotype

Punnett Square

Watch next

A pure-breeding tall plant producing oval fruit as described in Problem 2 is crossed to a pure-breeding short plant producing round fruit.

The F₁ are crossed to short plants producing oval fruit. What are the expected proportions of progeny phenotypes?