Biology Unit 2 8A

Monohybrid cross

A monohybrid cross is a prediction of the potential offspring genotypes when we know the exact genotypes of both parents.

Punnet square

Used to represent and work out monohybrid crosses

Genotype frequencies

Display the genotype probabilities in ratios or percentages based on the outcome of the punnett square

Phenotype frequencies

Display the phenotype probabilities in ratios or percentages based on the outcome of the punnett square

Monohybrid test cross

By crossing an individual with an unknown dominant genotype with a homozygous recessive individual to find out a dominant genotype.

→ If offspring of the test cross all have the dominant phenotype, then both parents are likely to be homozygous

→ If offspring of the test cross have both dominant and recessive phenotypes, then the dominant-phenotype parent must be heterozygous

Offspring

Children of the parents

Autosomal

Refers to chromosomes 1-22 (autosomes)