2. Genetics

Mendelian Principles — Quiz

Test your understanding of mendelian principles with 5 practice questions.

Practice Questions

Question 1

An individual heterozygous for gene A ($Aa$) self-crosses (Aa × Aa). The recessive phenotype frequency is 25%. What is the probability that exactly two out of five offspring will display the recessive phenotype?

Question 2

In a monohybrid F2 population of 100 plants, 85 show the dominant phenotype and 15 the recessive. Using a 3:1 expected ratio, what is the chi-square ($\chi^{2}$) statistic?

Question 3

When two homozygous recessive mutants for the same visible phenotype are crossed and their F1 progeny display the wild-type phenotype, what conclusion can be drawn?

Question 4

In an F1 trihybrid cross (AaBbCc × AaBbCc), what is the expected phenotypic ratio of offspring exhibiting all three dominant traits?

Question 5

In a backcross between an F1 dihybrid (AaBb) and a homozygous recessive tester (aabb) assuming independent assortment, what fraction of offspring will exhibit the parental phenotypes?