Author Question: Which types of phenotypic ratios are likely to occur in crosses when dealing with a single gene pair ... (Read 69 times)

ap345 · **on:** Mar 26, 2020

Question 1

Tightly curled or wooly hair is caused by a dominant gene in humans. If a heterozygous curly-haired person marries a person with straight hair, what percentage of their offspring would be expected to have straight hair?
◦ 25% straight
◦ 50% straight
◦ 100% straight
◦ 75% straight
◦ It is impossible to predict the outcome.

Question 2

Which types of phenotypic ratios are likely to occur in crosses when dealing with a single gene pair for which all the genotypic combinations are of equal viability?
◦ 12:3:1, 9:7
◦ 9:3:3:1, 27:9:9:9:3:3:3:1
◦ 1:4:6:4:1, 1:1:1:1
◦ 2:3, 1:2
◦ 1:2:1, 3:1

al · **Reply #1 on:** Mar 26, 2020

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