Monohybrid and Dihybrid Practice

In guinea pigs, the allele for short hair is dominant over the allele for long hair.
B = short 
b = long
What would the cross be for two heterozygous guinea pigs?

• BB X BB
• BB X Bb
• Bb X Bb
• bb X bb

Tags

NGSS.HS-LS3-1

Smooth seeds are dominant over wrinkled seeds.
What is the genotype ratio for the following cross?
Nn X NN

• NN = 100%, Nn = 0%, nn = 0%
• NN = 50%, Nn = 25%, nn = 25%
• NN = 50%, Nn = 50%, nn = 0%
• NN = 25%, Nn = 50%, nn = 25%

Tags

NGSS.HS-LS3-3

Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what are the expected phenotype percentages for the offspring of a heterozygous hairy plant and a hairless plant?

• 100% hairy, 0% hairless
• 75% hairy, 25% hairless
• 50% hairy, 50% hairless
• 25% hairy, 75% hairless

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

What goes in box 1

• AABb
• AABB
• aabb
• AaBb

Tags

NGSS.HS-LS3-2

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%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

Tags

NGSS.HS-LS3-1

Which of the following genotypes is homozygous dominant?

• A
• Aa
• AA
• aa

Tags

NGSS.HS-LS3-1

Which of the following is homozygous dominant?

• Yy
• Y
• yy
• YY

Tags

NGSS.HS-LS3-1

Which of the following is homozygous recessive?

• Tt
• tt
• TT
• T

Tags

NGSS.HS-LS3-1

What is the genotype for a pea plant heterozygous for round seeds (R), and homozygous recessive for green seeds (y)?

• Ry
• RRyy
• RrYy
• Rryy

Tags

NGSS.HS-LS3-1