Genetics Vocab Worksheet

A cross between individuals that involves one pair of contrasting traits

• Dihybrid cross

• Monohybrid cross

An allele that is fully expressed in the phenotype of the species. It "covers" the recessive trait, but is not necessarily a more desirable trait.

• Recessive allele

• Dominant allele

An allele whose phenotypic effect is not observed in a heterozygous individual.

• Recesive Allele

• Dominant Allele

genetic makeup of an organism

• Phenotype

• Genotype

An organism's physical appearance, or visible traits.

• Phenotype

• Genotype

An organism that has two identical alleles for a trait

• Homozygous

• Heterozygous

An organism that has two different alleles for a trait

• Homozygous

• Heterozygous

the crossing of an individual of unknown genotype with a homozygous recessive individual to determine the unknown genotype

• Test cross

• Monohybrid cross

the adults used in the first experimental cross of a breeding experiment

• First filial generation

• Parental generation

• Second filial generation

The first generation of offspring resulting from a cross of two parent organisms, abbreviated the F1 generation.

• First filial generation

• Second filial generation