Punnett Square Practice

Front

What is a homozygous dominant genotype?

Back

A genotype consisting of two identical dominant alleles, such as AA.

Front

What is a homozygous recessive genotype?

Back

A genotype consisting of two identical recessive alleles, such as aa.

Front

What is a heterozygous genotype?

Back

A genotype consisting of one dominant and one recessive allele, such as Aa.

Front

In pea plants, what does the allele 'T' represent?

Back

Tallness, which is dominant over the allele 't' for shortness.

Front

What is the expected genotype ratio from a cross between a homozygous short plant (tt) and a heterozygous tall plant (Tt)?

Back

50% Tt (tall), 50% tt (short).

Front

What is the probability of obtaining purple-flowered offspring from two heterozygous purple flower plants (Pp x Pp)?

Back

3:1 ratio of purple to white flowers.

Front

What does a 3:1 ratio in a Punnett square indicate?

Back

It indicates that for every four offspring, three are expected to show the dominant trait and one the recessive trait.

Front

What are the genotypes of parents that produce 100% heterozygous offspring?

Back

TT (homozygous dominant) crossed with tt (homozygous recessive).

Front

What is the purpose of a Punnett square?

Back

To predict the genotypes and phenotypes of offspring from genetic crosses.

Front

What does it mean if a trait is dominant?

Back

It means that the trait will be expressed in the phenotype even if only one dominant allele is present.