Exam 2: Heredity and Evolution

In regions where malaria is present, it acts as a selective agent that favors the heterozygous phenotype, because people with sickle-cell trait produce more offspring than those with only normal hemoglobin, who may die of malaria.

Explain Mendel's principle of segregation.

Which of the following is not a polygenic trait?

Which statement concerning polygenic traits is not true?

What produces new alleles at a locus?

Define genetic drift. How are founder effect and genetic drift related?

Mitochondrial DNA (mtDNA) is extremely useful for studying genetic change over time.

What is an individual's actual genetic make-up called?

Discuss the differences between Mendelian and polygenic modes of inheritance. Provide an example of a Mendelian and a polygenic trait.

Genetic drift is

Two people (both heterozygotes) are able to taste a chemical substance called PTC. The ability to taste PTC is caused by a dominant allele (T). The inability to taste PTC is caused by a recessive allele (t). What proportion of their children would be expected not to be able to taste PTC?

In order for a mutation to be passed on to offspring, the mutation must

All human genetic disorders are inherited as recessive traits.

In Mendel's experiments, the tall parental (P) plants

The ABO blood type system consists of ______ alleles.

New alleles are the results of mutations.

The relationship between malaria and the HbS allele is an example of natural selection as a factor that can cause directional change in allele frequencies.

In Mendel's experiments, what was the ratio of tall to short plants in the F2 generation?

Gregor Mendel is known for which of the following?

What is meant by the statement, "natural selection is the one factor that can cause directional change in allele frequency relative to specific environmental factors"?