Monohybrid Cross Problem Set

Problem 5: Another F1 hybrid cross

Tutorial to help answer the question

A genetic cross between two F1-hybrid pea plants having yellow seeds will yield what percent green-seeded plants in the F2 generation? Yellow seeds are dominant to green.

Tutorial

The F1-hybrid plants have the dominant, yellow seed phenotype, but the recessive alleles segregate during gamete formation. In the Punnett square, we see that one out of four possible combinations of F2-generation plants has the homozygous recessive genotype.

Mendel's result for this cross was 6022 yellow-seeded plants and 2001 green-seeded plants, a ratio of 3.01:1

The Biology Project
Department of Biochemistry and Molecular Biophysics
University of Arizona
Thursday, October 1, 1998
Revised: November 2004
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