Mendelian Genetics Review

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

• A carrier

• Heterozygous

• Homozygous dominant

• Homozygous recessive

Characteristics such as eye color, hair color, and height are called

• alleles

• genes

• traits

• genotypes

A hybrid

• Has two of the same genes

• Shows the recessive trait

• Always shows both traits

• Has one dominant and one recessive gene

If long fur is dominant to short fur in mice, a mouse with genes Bb would have ________ fur.

• Medium

• Black

• Short

• Long

Which trait(s) are expressed in the heterozygote in Mendelian inheritance (dominant/recessive)?

• Both the dominant and recessive traits

• A blend of the dominant and recessive trait

• The recessive trait

• The dominant trait

The tall allele, T, is dominant to the short allele, t, in Mendel’s pea plants. You examine a pea plant that exhibits the tall phenotype. What is its genotype?

• TT

• Tt

• tt

• Could be either TT or Tt

The gene for brown eyes (B) is dominant over the gene for blue eyes (b). Two brown-eyed people have a blue-eyed child. Which genotypes make this possible?

• One parent is homozygous brown-eyed and the other parent is heterozygous brown-eyed.

• Both parents are homozygous blue-eyed.

• Both parents are heterozygous brown-eyed.

• Both parents are homozygous brown-eyed.

The law that states that a random distribution of alleles occurs during formation of gametes is called

• Law of dependent assortment

• Law of independent assortment

• Law of segregation

• Law of gravity

Which summarizes the genetic research completed by the Austrian monk Gregor Mendel?

• Mendel developed the principles of genetics.

• Mendel hypothesized that the traits of pea plant offspring are not inherited.

• Mendel bred various dog breeds to discover the science of genetics.

• After years of research, Mendel identified the genes for flower colors.

An organism with two different alleles for a particular trait is

• Homozygous

• Heterozygous

• Purebred

• Incapable of reproduction