Exam 4: Extensions of Mendelian Inheritance

Heavy metals, such as copper, are required for proper development. However, if too much copper is present it can lead to developmental defects. A scientist was interested in studying the developmental defects that could occur at various concentrations of copper. Genetically identical organisms were grown in 6 different concentrations of copper. This experiment evaluates a(n) ________.

A ________ allele is the most prevalent allele in a population and usually encodes a protein that is made in the proper amount and functions normally.

The trait of cream-colored eyes in Drosophila is an example of ________.

Humans homozygous for the sickle cell allele have sickle cell anemia. A human that is heterozygous for the sickle cell allele is an example of ________.

A woman who is heterozygous for an allele that results in X-linked pattern baldness marries a man who is nonbald. Which of the following would be true of their offspring?

In an epistatic interaction, the genes must be located on the same chromosome.

In a dihybrid cross of two heterozygous individuals, you expect a 9:3:3:1 phenotypic ratio in the offspring, but observe a ratio of 9:7. What is the most likely explanation?

In codominance, both alleles make functional gene products which are expressed simultaneously.