Genetics: Dominance and Genotypes

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present. It is represented by a capital letter.

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present. It is represented by a lowercase letter.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as AA or aa.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Aa.

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., AA, Aa, aa).

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

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.

Front

What is the probability of an event?

Back

The probability of an event is a measure of the likelihood that the event will occur, expressed as a fraction or percentage.

Front

If a brown mouse (BB) is crossed with a tan mouse (bb), what will be the phenotype of the offspring?

Back

100% brown mice.

Front

In a cross between Aa and Aa, what is the probability of getting aa offspring?

Back

25%.