Basic Genetics-Punnett Squares

Front

What is a genotype?

Back

The genetic makeup of an organism, represented by letters (e.g., GG, Gg, gg).

Front

What is a phenotype?

Back

The physical appearance or observable traits of an organism, influenced by its genotype.

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., AA or aa).

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Aa).

Front

What is a dominant allele?

Back

An allele that expresses its trait even when only one copy is present (e.g., G in Gg).

Front

What is a recessive allele?

Back

An allele that only expresses its trait when two copies are present (e.g., gg).

Front

What is a Punnett square?

Back

A diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles.

Front

If a green pea plant (Gg) is crossed with a yellow pea plant (gg), what are the possible genotypes of the offspring?

Back

50% heterozygous (Gg) and 50% homozygous recessive (gg).

Front

What are the genotypes of two heterozygous brown-eyed parents?

Back

Bb and Bb.

Front

Which genotype is homozygous dominant?

Back

AA.