Class VI - Gene interactions

A 15:1 F2 phenotypic ratio of a dihybrid cross is typical of:

• redundancy

• overdominance

• modifiers

• epistasis

A mutation in a flower pigment production pathway removes an intermediate compound necessary for the production of red color. As a result, the flower is white, despite being wildtype for the enzyme that makes red pigment. This phenomenon is best described as an example of:

• hemizygosity

• X-linked

• epistasis

• redundancy

Here are the results of a complementation test. How many other strains have mutations in the same gene as strain "1" ?

• 0

• 1

• 2

• 3

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A phenomenon where two affected, recessive parents have unaffected offspring

• complementation

• lethal alleles

• pleiotropy

• X-linked

Tags

NGSS.HS-LS3-1

A mutation in a single gene impacts flower color and plant height. This is an example of:

• epistasis

• modifiers

• pleiotropy

• overdominance

You expect a 3:1 ratio of phenotypes from a F2 monohybrid cross. Instead you observe 2:1. What might be happening?

• allele is lethal in homozygotes

• there are modifiers

• there is redundancy in the genome

• the gene has pleiotropic functions

Tags

NGSS.HS-LS3-2

You cross a black to a white mouse and get a brown mouse. What type of genetic interaction might be occurring?

• redundancy

• pleiotropy

• lethal alleles

• modifiers

Deep in the heart of a top secret McDonald's research facility, you breed two mutant white Grimaces together and get a wildtype purple

Grimace. What could explain this outcome?

• Overdominance

• Complementation

• Modifiers

• Incomplete penetrance

Human males have 1. ___ copies of the X chromosome, making genes on this chromosome 2. ___

• 1. 2

  2. 2. Homozygous

• 1. 1. 1

  2. 2. Homozygous

• 1. 1. 1

  2. 2. Hemizygous

• 1. 1. 2

  2. 2. Hemizygous