Complete Dominance

Front

What is complete dominance in genetics?

Back

Complete dominance occurs when the phenotype of the heterozygote is indistinguishable from that of the dominant homozygote.

Front

What is a dominant phenotype?

Back

A dominant phenotype is the observable trait that is expressed when at least one dominant allele is present in the genotype.

Front

What is a recessive phenotype?

Back

A recessive phenotype is the observable trait that is expressed only when two recessive alleles are present in the genotype.

Front

What does the term 'genotype' refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

Front

What does the term 'phenotype' refer to?

Back

Phenotype refers to the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genotypes of offspring from a genetic cross.

Front

What does 'homozygous' mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., AA or aa).

Front

What does 'heterozygous' mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Aa).

Front

If a plant has the genotype Rr, what is its phenotype for the trait of round seeds?

Back

The phenotype would be round seeds, as round (R) is dominant over wrinkled (r).

Front

In a cross between two heterozygous plants (Rr x Rr), what is the expected ratio of round to wrinkled seeds?

Back

The expected ratio is 3 round seeds to 1 wrinkled seed.