Retake: Genetics and Punnett Squares

Front

What is a heterozygous genotype?

Back

A heterozygous genotype consists of two different alleles for a particular gene, such as Bb.

Front

What is a homozygous recessive genotype?

Back

A homozygous recessive genotype consists of two identical recessive alleles for a gene, such as tt.

Front

Define genotype.

Back

A genotype is the genetic constitution of an individual, represented by the alleles inherited from the parents.

Front

What is the difference between dominant and recessive traits?

Back

Dominant traits are expressed in the phenotype even if only one dominant allele is present, while recessive traits are expressed only when two recessive alleles are present.

Front

If straight hair is recessive, what does that imply about curly hair?

Back

Curly hair is a dominant trait, meaning it will be expressed in the phenotype if at least one dominant allele is present.

Front

What does it mean for an organism to be homozygous?

Back

An organism is homozygous when it has two identical alleles for a specific gene, either dominant or recessive.

Front

What is a Punnett square used for?

Back

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

Front

How do you determine the percentage of homozygous recessive offspring in a genetic cross?

Back

To determine the percentage of homozygous recessive offspring, analyze the Punnett square results and count the proportion of offspring with the homozygous recessive genotype.

Front

What is the expected genotype ratio from a monohybrid cross between two heterozygous parents (Bb x Bb)?

Back

The expected genotype ratio is 1 BB : 2 Bb : 1 bb.

Front

What is the expected phenotype ratio from a monohybrid cross between two heterozygous parents (Bb x Bb) if B is dominant?

Back

The expected phenotype ratio is 3 dominant : 1 recessive.