Unit 3 Bundle 2 Performance Assessment

Achondroplasia is an inherited condition that affects the formation of bone in humans. The allele for achondroplasia (A) is dominant to the unaffected allele (a). If a person who is homozygous dominant has children with a person who is homozygous recessive, what percentage of their children will likely have achondroplasia? *Show your work on a separate sheet of paper and then place your answer in the box. Your answer must be a whole number.

A model of the genetic control of coat color in rabbits is shown:

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A cell undergoing a biological process is shown.

• Crossing over
• Chromosomal nondisjunction
• Genome replication
• Chromosomal deletion

In domesticated dogs, hair type is controlled by two different alleles. The allele for wire hair is (H) and the allele for smooth hair is (h). When two heterozygous dogs are crossed, what percentage of the offspring is expected to be homozygous for smooth hair? *Show ALL of the steps required on a separate sheet of paper and select the correct answer below.

• 25%
• 0%
• 75%
• 50%

A genetic cross involving two linked genes is represented. AaGG x aaGg Which genotype is NOT possible in the offspring produced by the cross?

• Aagg
• AaGG
• aaGg
• aaGG

Some angelfish colors are determined by codominance. Possible genotypes and phenotypes of angelfish colors are shown below.

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Gametes produced by an organism contain a combination of genes from that organism. In every gamete, this combination is -

• different due to independent assortment during meiosis
• the same because it is created from the same DNA
• the same because chromosomes are copied before meiosis
• different due to DNA replication prior to mitosis