Biology Genetics Review

Yellow and smooth are dominant traits for peas. Which are possible genotypes for a pea plant that produces green, wrinkled peas.

• YYSS

• YySs

• yyss

• Yyss

• YySS

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which genotype(s) represent a homozygous individual?

• Rr

• rr

• RR

Which genotype(s) represent a heterozygous individual?

• Rr

• rr

• RR

Which phenotype ratio would be expected from a cross of two individuals heterozygous for two traits? BbRr X BbRr

• 9:3:3:1

• 4:4:4:4

• 8:8

• none of the answers is correct

A flower exhibits incomplete dominance. A red flower is crossed with a white flower. What is the expected phenotypic outcome?

• 100% pink

• 100% red & white spotted

• 100% red

• 100% white

A colorblind father will pass the allele for colorblindness to

• 100% of his daughters

• 50% of his daughters

• 100% of his sons

• 50% of his sons

Tags

NGSS.HS-LS3-1

A colorblind mother will pass the allele for colorblindness to

• 100% of her daughters

• 50% of her daughters

• 100% of her sons

• 50% of her sons

Tags

NGSS.HS-LS3-1

What is the phenotype in the bottom right square? (Yellow is dominant and green is recessive)

• yy
• Yy
• yellow
• green

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the type of dominance when the two traits aren't dominant over each other, but whose heterozygous outcome is blended?

• co-dominance
• simple dominance
• incomplete dominance
• non-dominance

Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r  = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds? 

• 0%
• 25%
• 50%
• 100%