Unit 7 Genetics Test Review

Front

What does Mendel’s law of segregation state?

Back

The two alleles for a trait separate when gametes are formed.

Front

What is the genotype of a female fruit fly with red eyes that is heterozygous?

Back

X^R X^r

Front

If a red-eyed male fruit fly (X^R Y) is crossed with a heterozygous female (X^R X^r), what percent of their offspring will have white eyes?

Back

25%.

Front

What is codominance in genetics?

Back

A situation where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.

Front

In chickens, what is the phenotype of a heterozygous chicken with alleles B (black) and W (white)?

Back

Erminette (black and white spotted).

Front

What percent of the offspring will be erminette when an erminette chicken is crossed with a black chicken?

Back

50%.

Front

What are the possible allele combinations from a parent with genotype BbRr?

Back

BR, Br, br, br.

Front

What is a Punnett square used for?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What is the phenotype of flowers if the Punnett square shows a mix of red and white alleles?

Back

The flowers would be pink.

Front

Define genotype.

Back

The genetic makeup of an individual, represented by the alleles they possess.