Genetics Quiz

The “father” of genetics was

• T. A. Knight.

• Hans Krebs.

• Gregor Mendel.

• None of the above

What is the probability that the offspring of a homozygous dominant individual and a homozygous recessive individual will exhibit the dominant phenotype?

• 25%

• 50%

• 75%

• 100%

The passing of traits from parents to offspring is called

• genetics.

• development.

• heredity.

• maturation.

A genetic trait that appears in every generation of offspring is called

• dominant.

• recessive.

• phenotypic.

• superior.

To describe how traits can disappear and reappear in a certain pattern from generation to generation, Mendel proposed

• the law of independent assortment.

• the law of segregation.

• the law of genotypes.

• that the F2 generation will produce only purple flowers.

The phenotype of an organism

• represents its genetic composition.

• reflects all the traits that are actually expressed (visible).

• occurs only in dominant pure organisms.

• cannot be seen.

If an individual has two recessive alleles for the same trait, the individual is said to be

• homozygous for the trait.

• haploid for the trait.

• heterozygous for the trait.

• mutated.

An individual heterozygous for a trait and an individual homozygous recessive for the trait are crossed and produce many offspring. These offspring are likely to be

• all the same genotype.

• of two different phenotypes.

• of three different phenotypes.

• all the same phenotype.

Tallness (T) is dominant over shortness (t) in pea plants. Which of the following represents the genotype of a pea plant that is heterozygous for tallness?

• T

• TT

• Tt

• tt

What fraction of the offspring resulting from a heterozygous X heterozygous monohybrid cross are homozygous recessive?

• 1/4

• 2/4

• 1/16

• 9/16