Punnett Square Practice

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.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene.

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

If T is tall and t is short, what is the genotype of a homozygous tall plant?

Back

TT (homozygous dominant) is the genotype of a homozygous tall plant.

Front

What is the expected genotype ratio from a cross between Tt and tt?

Back

50% Tt and 50% tt.

Front

What is the expected phenotype ratio from a cross between Tt and tt?

Back

50% tall and 50% short.

Front

What is the expected percentage of wrinkled plants from a cross of two heterozygous round pea plants (Ss x Ss)?

Back

25% will be wrinkled.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous conditions.