Monohybrid Cross Practice

T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt
• Tt
• Bb
• TT

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Based on the completed Punnett square, what is the phenotypic Ratio?

• 1:2:1

• 3:2

• 3:1

• 1:3:1

Tags

NGSS.HS-LS3-1

In watermelons, green rinds (G) are dominant to striped rinds (g).  What is the genotype of a heterozygous green watermelon?

• GG
• Gg
• gg
• green

Tags

NGSS.HS-LS3-1

Chickens can have different types of feathers. Frizzled feathers curl toward a chicken’s head. Assume that feather type is determined by a single gene and that the allele for frizzled feathers is dominant over the allele for straight feathers. In a cross between two chickens with straight feathers, what percentage can be expected to have frizzled feathers?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-3

In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a brown cocker spaniel is crossed with a heterozygous black cocker spaniel, which of the following genotypic ratios can be expected?

• 0 BB: 2 Bb: 2 bb

• 1 BB: 2 Bb: 1 bb

• 2 BB: 2 Bb: 1 bb

• 2 BB: 1 Bb: 0 bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

NGSS.HS-LS3-2

Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. What is the expected outcome of crossing two tomato plants that are heterozygous for hairy stems?

• 75% hairy stems: 25% hairless stems

• 100% hairy stems

• 100% hairless stems

• 50% hairy stems: 50% hairless stems

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Facial dimples (D) are considered dominant human traits, whereas someone with no dimples (d) is recessive. What are the expected phenotypes of the offspring of a heterozygous female with dimples and a male with no dimples?

• 25% dimples: 75% no dimples

• 50% dimples: 50% no dimples

• 75% dimples: 25% no dimples

• 100% dimples

Tags

NGSS.HS-LS3-1