Dominant and Recessive Traits Flashcard

Front

What is a dominant trait?

Back

A dominant trait is a genetic trait that is expressed in the phenotype even when only one copy of the allele is present.

Front

What is a recessive trait?

Back

A recessive trait is a genetic trait that is only expressed in the phenotype when two copies of the allele are present.

Front

What does genotype refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses.

Front

What does phenotype refer to?

Back

Phenotype refers to the physical appearance or visible traits of an organism.

Front

If a parent has genotype Bb, what alleles can they pass on to their offspring?

Back

They can pass on either the dominant B allele or the recessive b allele.

Front

What is the probability of obtaining a recessive phenotype from a cross of Tt x Tt?

Back

25% probability of obtaining a recessive phenotype.

Front

In a genetic cross, what does a Punnett square represent?

Back

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

Front

What is the expected genotype ratio from a cross of Bb x bb?

Back

The expected genotype ratio is 1 Bb : 1 bb.

Front

What is the expected phenotype ratio from a cross of Tt x Tt?

Back

The expected phenotype ratio is 3 dominant : 1 recessive.

Front

What is the significance of the allele combination Aa?

Back

Aa represents a heterozygous genotype, where one dominant and one recessive allele are present.