LS.7.2.3 - Punnett Squares & Pedigrees

What is a pedigree?

• A chart that shows all possible allele combinations from a genetic cross

• A diagram that shows the occurrence of a genetic trait in several generations of a family

• An organism's physical appearance

• The process of selecting parents with desired traits

Which term describes an allele whose trait always shows up in the organism when the allele is present?

• Recessive allele

• Dominant allele

• Genotype

• Phenotype

What does a Punnett Square show?

• The physical appearance of an organism

• The process of selective breeding

• All the possible combinations of alleles from a genetic cross

• The occurrence of a trait in a family

Which of the following is represented by a two-letter code?

• Phenotype

• Genotype

• Pedigree

• Selective breeding

What is the term for an organism that has two different alleles for a trait?

• Homozygous

• Heterozygous

• Phenotype

• Pedigree

• It will show the recessive trait

• It will show the dominant trait

• It will show both traits equally

• It will not show any trait

Which of the following best describes selective breeding?

• Crossing two organisms at random

• Selecting a few organisms with desired traits to be parents of the next generation

• Using a Punnett Square to predict traits

• Drawing a pedigree chart

If an organism is homozygous for a trait, which of the following could be its genotype?

• Aa

• AB

• aa

• Ab

A pedigree shows that a certain trait appears in every generation of a family. What does this suggest about the trait?

• It is likely a recessive trait

• It is likely a dominant trait

• It is not inherited

• It is caused by the environment

• 0%

• 25%

• 50%

• 100%