# Bio 110 - Exam 3 questions

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You cross two true-breeding parents (one with yellow seeds and one with green seeds), grow and self-pollinate the F1 generation, and then count the number of offspring with yellow and green seeds in the F2 generation. If you counted 2,000 offspring and there was a 3:1 ratio of yellow:green seeds, how many offspring would have yellow seeds?

500
667
1999
1,500
1,000
When Mendel crossed a true-breeding purple-flowered pea plant with a true-breeding white-flowered pea plant, he observed that all of the F1 offspring had purple flowers. When these F1 plants were selfed, he found 3/4 were purple and 1/4 were white. Which of the following observations supports Mendel's conclusion that each progeny can carry two alternative copies of a "factor"?

A. When the white progeny are selfed, only white progeny result.
B. When the purple progeny are crossed with the white progeny, only purple progeny result.
C. When the purple progeny are selfed, only purple progeny result.
D. When the purple progeny are selfed, both white and purple progeny result.
You are given two plants. One plant is tall and the other is short. You cross these parental plants and find all F1 progeny are tall. You cross the F1 progeny with one another and find the resulting F2 generation is composed of 770 tall plants and 300 short plants. You should conclude that ___________.

both parental plants are homozygous, and short is dominant to tall
both parental plants are heterozygous, and short is dominant to tall
you can't tell from the information given
the F1 plants are heterozygous, and tall is dominant to short
the F1 plants are homozygous, and tall is dominant to short