Unit 7 assessment

Front

What is a homozygous dominant genotype?

Back

A homozygous dominant genotype has two identical dominant alleles, represented as 'YY'.

Front

What is a homozygous recessive genotype?

Back

A homozygous recessive genotype has two identical recessive alleles, represented as 'tt'.

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

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 the ratio of homozygous recessive offspring from a cross of two heterozygous parents (Tt x Tt)?

Back

The ratio is 1 in 4, or 25%.

Front

Which nitrogenous base is NOT part of DNA?

Back

Uracil is NOT part of DNA; it is found in RNA.

Front

What are alleles?

Back

Alleles are different forms of a gene that can exist at a specific locus on a chromosome.

Front

What does it mean for an organism to be heterozygous?

Back

An organism is heterozygous if it has two different alleles for a particular gene, such as 'Tt'.

Front

What is the purpose of a Punnett square?

Back

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

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous conditions.