4.11 Unit Test Mendelian Genetics

Question: What are these units of hereditary information called today?

Answer: Genes

Question: Which term describes the form of a gene that produces a specific trait, such as eye color?

Answer: Allele

Question: Which term describes a type of trait that is usually expressed only when an organism has two identical alleles for the trait?

Answer: Recessive

Question: Which Punnett square best describes this cross?

Answer: all of the squares have Rr in them

Question: What do the letters in each box of a Punnett square tell you?

Answer: the possible combinations of alleles in offspring based on the parents’ genetic makeup

Question: Which ratio of red-to-white flowering plants would she expect to see in the phenotypes of the F2 generation?

Answer: 3 red: 1 white

Question: What does this combination of offspring tell her about the genetic makeup of the red geranium parent?

Answer: The red geranium is heterozygous for red flowers (Rr)

Question: Which type of inheritance is this an example of?

Answer: Codominance

Question: What ratio would you expect to see in the phenotypes of their offspring?

Answer: All with yellow and red stripes

Question: Which statement best describes the relationship between a gene and an allele?

Answer: An allele is a variant of a gene.