Punnett Squares

Dominant alleles are represented by a _______.

• small letter

• capital letter

• number

• symbol

Define heterozygous.

• An organism with two identical alleles for a trait.

• An organism with two different alleles for a trait.

• An organism that has no alleles for a trait.

• An organism that can only express one allele.

Purebred is the same as _______ and hybrid is the same as ________.

• homozygous, heterozygous

• heterozygous, homozygous

• homozygous, homozygous

• heterozygous, heterozygous

What does the term 'phenotype' refer to?

• The genetic makeup of an organism.

• The observable characteristics of an organism.

• The evolutionary history of an organism.

• The habitat in which an organism lives.

Which of the following is homozygous recessive? (Tt, tt, TT, T)

• Tt

• tt

• TT

• T

What is the expected phenotypic ratio of a monohybrid cross between two heterozygous parents?

• 1:2:1

• 2:1

• 3:1

• 4:0

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

• recessive

• dominant

• co-dominant

• incomplete dominant

What does the term 'genotype' refer to?

• The physical appearance of an organism.

• The genetic makeup of an organism.

• The environmental influences on an organism.

• The evolutionary history of an organism.

What is the significance of a test cross?

• To determine the genotype of an individual with a dominant phenotype.

• To identify the phenotype of a recessive individual.

• To assess the environmental impact on phenotype expression.

• To evaluate the genetic diversity within a population.

What is a Punnett Square used for?

• To predict the genotypes of offspring from parental genotypes.

• To determine the physical appearance of an organism.

• To analyze the behavior of genes in a population.

• To measure the genetic diversity of a species.