Biology Review: Intro to Genetics

Which describes the type of cross shown in the picture?

• co dominance: both homozygous alleles make up the phenotype for the heterozygous
• incomplete dominance: both homozygous alleles become a mixture for the heterozygous
• Mutation: change in the DNA
• Nondisjunction: chromosomes separate incorrectly

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In plants, being short is the recessive gene.
Two heterozygous plants are crossed. What are the genotypes and phenotypes of the offspring?

• 25% TT; 50% Tt; 25% tt
  3 tall; 1 short
• 100% Tt
  100% tall
• 50% TT; 50% tt
  2 tall; 2 short
• 100% tt
  100% short

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Dimples is dominant to no dimples. According to the Punnett square, what are the odds the offspring would have dimples?

• 25%
• 50%
• 75%
• 100%

Tags

NGSS.HS-LS3-1

What pattern of inheritance is described by this example?

• incomplete dominance
• codominance
• simple dominance
• polygenic trait

Tags

NGSS.HS-LS3-1

What pattern of inheritance is described by this example?

• codominance
• incomplete dominance
• simple dominance
• multiple alleles

In the case of a trait that follows the pattern of simple dominance. Imagine an individual who is homozygous dominant for a the trait and a second individual is heterozygous. Which of the following is true?

• they have same phenotype and genotype
• they have different genotypes and phenotypes
• they have same phenotype but different genotypes
• they have same genotype but different phenotypes

Examine the pedigree. Assuming the presence of white forelock hair trait is dominant to no forelock. What can you tell about the individuals labeled "2" in the chart?

• the male is heterozygous and the female is homozygous.
• the male is homozygous and the female is heterozygous.
• the male is homozygous and the female is homozygous.
• the male is heterozygous and the female is heterozygous.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

One form of a gene is called_______________

• a DNA
• a Phenotype
• a trait
• an allele

Tags

NGSS.HS-LS3-2

Colorblindness is more common in males than in females because

• Colorblindness is a sex-linked recessive trait

• Colorblindness is dominant over normal vision

• Colorblindness is an example of codominance

• Colorblindness is caused by environmental changes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

When an individual produces gametes, the two copies of the gene separate, so that each gamete receives only one copy

• law of independent assortment
• law of segregation
• law of conservation of mass
• law of conservation of energy