Genes and Punnett Squares

Front

What does homozygous mean?

Back

Having two of the same genes for a trait (sometimes called pure).

Front

What is a phenotype?

Back

The physical trait of an organism.

Front

What is heredity?

Back

The passing of genetic traits from parent to offspring.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup, while phenotype refers to the physical expression of traits.

Front

What does it mean if a trait is dominant?

Back

A dominant trait is one that will express itself in the phenotype even if only one copy of the allele is present.

Front

What is a gene?

Back

A segment of DNA that contains the instructions for building a specific protein or trait.

Front

What is an allele?

Back

An alternative form of a gene that can produce different traits.

Front

What is the purpose of a Punnett square?

Back

To predict the possible genotypes and phenotypes of offspring from a genetic cross.

Front

If brown fur color is dominant over black fur color, what would the phenotype of an offspring with genotype Aa be?

Back

Brown fur.

Front

What is the genotype of an organism with a homozygous recessive trait?

Back

It has two recessive alleles (e.g., aa).