Punnett Squares - Challenge yourself?

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Front

What does it mean for a trait to be dominant?

Back

A dominant trait is one that will appear in the phenotype even if only one allele is present.

Front

What does it mean for a trait to be recessive?

Back

A recessive trait is one that will only appear in the phenotype if two copies of the allele are present.

Front

What is the genotype of a heterozygous organism?

Back

The genotype of a heterozygous organism consists of two different alleles, such as Bb.

Front

What is the genotype of a homozygous dominant organism?

Back

The genotype of a homozygous dominant organism consists of two identical dominant alleles, such as BB.

Front

What is the genotype of a homozygous recessive organism?

Back

The genotype of a homozygous recessive organism consists of two identical recessive alleles, such as bb.

Front

If two heterozygous plants (Tt) are crossed, what is the expected percentage of offspring that are homozygous recessive (tt)?

Back

25% of the offspring will be homozygous recessive (tt).

Front

In a cross between Bb and bb, what is the probability of producing a homozygous dominant offspring?

Back

0% probability of producing a homozygous dominant offspring.

Front

What is the expected phenotypic ratio of a monohybrid cross?

Back

The expected phenotypic ratio of a monohybrid cross is 3:1 for dominant to recessive traits.

Front

What does the term 'allele' refer to?

Back

An allele is a variant form of a gene that can produce different traits.