Exploring Genetics Vocabulary

What is a trait in genetics?

• A physical expression

• An inherited characteristic

• A segment of DNA

• A form of a gene

Tags

NGSS.HS-LS3-1

Which term describes different forms of a gene?

• Allele

• Phenotype

• Genotype

• Trait

What does a dominant allele do?

• It is always masked by the recessive allele

• It codes for a trait

• It always expresses itself when present

• It is a physical expression

What is the genotype of a homozygous dominant individual?

• A

• Aa

• AA

• aa

What is the phenotype of an individual with the genotype Aa?

• Homozygous

• Dominant

• Recessive

• Heterozygous

What is the first step in solving a genetics problem using a Punnett square?

• Determine the gametes

• Set up a key and identify dominant and recessive alleles

• Identify the parental genotypes

• Fill in the Punnett square

In a monohybrid cross of two heterozygous plants (Aa x Aa), what is the expected phenotype ratio?

• 1:1

• 3:1

• 2:2

• 1:2:1

Tags

NGSS.HS-LS3-3

What is the genotype ratio when crossing a heterozygous plant (Aa) with a homozygous recessive plant (aa)?

• 1:2:1

• 2:2

• 3:1

• 1:1

What is a test cross used for?

• To determine the unknown genotype of an organism

• To identify the dominant allele

• To find the recessive allele

• To determine the phenotype of an organism

If a test cross results in all purple offspring, what can be inferred about the genotype of the purple parent?

• It is homozygous recessive

• It is heterozygous

• It is homozygous dominant

• It is a mix of dominant and recessive

Tags

NGSS.HS-LS3-1