4. Genetics

Mendelian Genetics — Quiz

Test your understanding of mendelian genetics with 5 practice questions.

Practice Questions

Question 1

In a test cross, an individual with an unknown genotype expressing a dominant phenotype is crossed with which of the following?

Question 2

Consider a cross between two pea plants heterozygous for flower color ($Pp$) and seed shape ($Ss$), where $P$ (purple) is dominant to $p$ (white) and $S$ (smooth) is dominant to $s$ (wrinkled). What is the probability of obtaining an offspring with white flowers and wrinkled seeds ($ppss$)?

Question 3

In a pedigree chart, if a trait appears in every generation and affects both males and females equally, what is the most likely mode of inheritance?

Question 4

If a genetic cross produces offspring with a phenotypic ratio of $1:2:1, which of the following inheritance patterns is most likely at play?

Question 5

A woman is a carrier for an X-linked recessive disorder (genotype $X^A X^a$) and her husband is unaffected (genotype $X^A Y$). What is the probability that their son will be affected by the disorder?