dihybrids and pedigrees

Front

What is a dihybrid cross?

Back

A genetic cross that involves two traits, where each trait is represented by two alleles.

Front

What does a filled square represent in a pedigree chart?

Back

An affected male.

Front

What does a filled circle represent in a pedigree chart?

Back

An affected female.

Front

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

Back

RRYy.

Front

If a pedigree shows a recessive disorder, what must the genotype of an affected individual be?

Back

hh.

Front

In a dihybrid cross, how many boxes are needed in the Punnett square?

Back

16 boxes.

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

What is the purpose of a pedigree chart?

Back

To track the inheritance of traits through generations.

Front

What is the phenotype ratio expected from a dihybrid cross?

Back

9:3:3:1.