Genetics

Front

What is the definition of homozygous dominant?

Back

An organism with two identical dominant alleles for a trait (e.g., YY).

Front

What does a Punnett square represent in genetics?

Back

A tool used to predict the probability of offspring genotypes from parental genotypes.

Front

What is the probability of an offspring being homozygous recessive from two heterozygous parents (Bb x Bb)?

Back

25%.

Front

Define allele.

Back

A variant form of a gene that can produce different traits.

Front

What is a recessive allele?

Back

An allele whose trait only shows up when no dominant allele is present.

Front

What does the term genotype refer to?

Back

The genetic makeup of an organism, represented by alleles (e.g., BB, Bb, bb).

Front

What is a phenotype?

Back

The observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

How many boxes are in a standard Punnett square for a monohybrid cross?

Back

4 boxes.

Front

What is the expected genotype ratio from a monohybrid cross?

Back

1:2:1 (homozygous dominant : heterozygous : homozygous recessive).

Front

What is the expected phenotype ratio from a monohybrid cross?

Back

3:1 (dominant : recessive).