Dihybrid crosses

Front

What is a dihybrid cross?

Back

A genetic cross that examines the inheritance of two different traits, typically represented by two pairs of alleles.

Front

What is the genotype for a pea plant homozygous for round seeds (R) and heterozygous for yellow seeds?

Back

RRYy

Front

What is the expected phenotypic ratio of a dihybrid cross?

Back

9:3:3:1, representing the four possible phenotypes.

Front

What does the term 'homozygous' mean?

Back

Having two identical alleles for a particular gene.

Front

What does the term 'heterozygous' mean?

Back

Having two different alleles for a particular gene.

Front

In a dihybrid cross, what is the probability of obtaining an offspring that is tall and white?

Back

3 out of 16.

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

What goes in box 3 of a dihybrid cross Punnett square with alleles AaBb?

Back

Aabb

Front

What fraction of the offspring will have wrinkled, yellow seeds in a dihybrid cross?

Back

3/16.

Front

What goes in box 15 of a dihybrid cross Punnett square with alleles AaBb?

Back

aabb.