Chapters 4-5

Mendel's "characters" were eventually revealed to be___.

• Genes

• Nucleotides

• Chromosomes

• Cells

A person that has two identical alleles for a particular gene is ___ for that genotype.

• Recessive

• Homozygous

• Dominant

• Heterozygous

Mendel followed the inheritance of traits through several generations in which organism?

• Mice

• Peas

• Corn

• Humans

Alleles are___

• Alternative forms of a single gene

• Genes located near one another

• Mutations in a single gene

• Duplicate pairs of a single chromosome

In Mendel's pea plants, the allele for tall phenotype (T) is dominant to the allele for a short phenotype (t). Which is the genotype for a short pea plant.

• TT

• Tt

• tt

• TtTt

A heterozygote for a particular gene has ___

• 2 dominant alleles

• 2 recessive alleles

• 1 dominant, 1 recessive gene

• 2 variants of an allele

The second generation resulting from a genetic cross is the ___ generation.

• P1

• P2

• F1

• F2

A genotypic ratio of 1:2:1 and phenotypic ratio of 3:1 results from a ___ cross.

• allelic

• monohybrid

• test

• dihybrid

The phenotypic ratio expected to result from a dihybrid cross is___

• 3:1

• 1:2:1

• 9:3:1

• 9:3:3:1

For two traits, A and B, what are the genotypes of the gametes that a heterozygote would produce?

• AB,Ab,aB,ab

• AB,AB,ab,ab

• Ab,Ab,ab,ab

• aB,ab,Ab,Ab