Punnett Squares - Complete Dominance

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 'complete dominance' mean in genetics?

Back

Complete dominance occurs when the phenotype of the dominant allele completely masks the phenotype of the recessive allele in a heterozygous individual.

Front

What is the dominant phenotype in pea plants when smooth (S) is dominant over wrinkled (s)?

Back

The dominant phenotype is smooth peas.

Front

What are genotypes?

Back

Genotypes are the genetic makeup of an organism, represented by alleles (e.g., RR, Rr, rr).

Front

What is the genotype of a homozygous dominant plant?

Back

The genotype of a homozygous dominant plant is represented as 'RR'.

Front

What is the genotype of a homozygous recessive plant?

Back

The genotype of a homozygous recessive plant is represented as 'rr'.

Front

If a plant has the genotype Rr, what is its phenotype?

Back

The phenotype is smooth peas, as the dominant allele (R) is expressed.

Front

What is the probability of obtaining a homozygous recessive offspring from a cross between Rr and Rr?

Back

The probability is 25%.

Front

What does it mean for an organism to be homozygous?

Back

An organism is homozygous when it has two identical alleles for a particular trait (e.g., BB or bb).

Front

What does it mean for an organism to be heterozygous?

Back

An organism is heterozygous when it has two different alleles for a particular trait (e.g., Rr).