Question

In a certain plant, yellow leaves are dominant (Y) and red leaves are recessive (y). A plant with genotype Yy and a plant with Yy are crossed. If they have four offspring, how many would you predict would have red leaves?

A=4
B=1
C=2
D=3

Answer 1

In a cross between two Yy plants, where Y signifies yellow and is dominant, and y represents red, which is recessive, a Punnett square predicts that one out of four offspring will have the genotype yy, meaning red leaves.

Step-by-step explanation:

The question asks about the genotypic and phenotypic outcomes of a cross between two plants with genotypes Yy, where yellow leaves (Y) are dominant to red leaves (y). To predict the number of offspring with red leaves in a Yy x Yy cross, we use a Punnett square to show all possible combinations of alleles from each parent.

When we fill out the Punnett square, the following genotypes result: YY, Yy, Yy, and yy. Each square represents a 25% probability for each outcome, given that the events are independent. Typically, we have:

YY = Yellow leaves (25%)

Yy = Yellow leaves (50%)

yy = Red leaves (25%)

Therefore, out of four offspring, on average, one is expected to have red leaves (genotype yy). The correct answer is:
B: 1

Answer 2

THe answer is C.2

Step-by-step explanation: