Unit 3 Test Review - Genetics 2023

A horticulturalist wants to produce geraniums with specific characteristics. She knows that the trait of red flowers is governed by the allele R (RR and Rr) and the trait of white flowers is governed by the allele r (rr).

 

The horticulturalist plans to cross a geranium that is homozygous for red flowers with a geranium that is homozygous for white flowers.

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Two mice with a Mendelian trait for black fur are bred and have the litter shown. What is the most likely explanation for the presence of the white-fur offspring?

• One of the parents is heterozygous.

• Both of the parents are heterozygous.

• A mutation occurred.

• The parents' fur color has no influence on the offspring fur color.

A pair of mice are bred several times, generating the following data for the Mendelian trait of fur color. What are the most likely genotypes of the parents?

• FF and ff

• FF and Ff

• Ff and Ff

• Ff and ff

Two chickens with a codominant trait for feathers are bred and have five offspring, shown below. What are the most likely genotypes of the parents?

• RW and WR

• WR and WW

• RR and RW

• RR and WW

What relationship does the diagram show between the two alleles?

• Complete Dominance

• Incomplete Dominance

• Codominance

• Mendelian Genetics

If you were to take one of the heterozygous flowers above and breed it with a homozygous recessive flower above, what percentage of their offspring would be white?

• 0%

• 25%

• 50%

• 75%

What does the following diagram illustrate about the fur color of cows?

• The white and brown alleles show incomplete dominance.

• The brown and white alleles for fur color are codominant.

• The brown allele for fur color is dominant.

• The white allele for fur color is dominant.

The diagram below shows a happy family of mice, with two parents and four offspring. However, one of the offspring mice is an imposter. The black-fur parent has the genotype FF Ee, and the white-fur parent has the genotype ff Ee. Given these parent genotypes, which offspring mouse could not have been born to these parents?

• Mouse A (Ff Ee) 

• Mouse B (Ff EE) 

• Mouse C (Ff ee) 

• Mouse D (ff EE)

Two parents are wanting to have a baby. Dad's blood type is I^Ai and mom's blood type is I^Bi.  What are the possibilities of their future baby's blood type?

What are the most likely percentages for offspring of two chickens with BOTH red and white feather chicken parents? Hint: Complete a punnett square cross for 2 RW chickens.