Genes and Punnett Squares

Underlying instructions (alleles present)

• Genotype

• Phenotype

• Gene pool

A _____ allele has an effect when present in just one copy (on one chromosome)

• Dominant

• Recessive

• Multifactorial

The first generation in a genetic cross is the parental generation, or:

• F1

• F2

• F3

A _____ allele must be present on both chromosomes of a pair to be expressed

• Dominant

• Recessive

• Multifactorial

Tags

NGSS.HS-LS3-1

The masked trait is:

• Recessive

• Dominant

Any individual with two identical alleles for a gene is ____ for that gene

• Homozygous

• Heterozygous

An individual with two different alleles is _____ for that gene

• Homozygous

• Heterozygous

If both alleles are recessive, the individual is homozygous recessive, shown with

• 1 capital and 1 lowercase letter

• 2 capital letters

• 2 lowercase letters

An individual with two dominant alleles is homozygous dominant and has

• 1 capital and 1 lowercase letter

• 2 capital letters

• 2 lowercase letters

What is the phenotypic rule for a heterozygous crossed with another heterozygous in a dihybrid cross?

• 9:3:3:1

• 1:2:3:4

• 4:4:3:9