Monohybrid cross

In guinea pigs Black fur (B) is dominant to white(b), cross Bb x bb and determine genotypic ratio for offspring

• 2:2

• 0:2:2

• 1:2:1

• 2:2:0

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

In guinea pigs Black fur (B) is dominant to white fur (b) cross a white guinea with a heterozygous one,what is the genotypic ratio?

• 2:2

• 1:2:1

• 0:2:2

• 2:0:2

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In pea plants Tall stems (T)are dominant to short stems (t) cross a homozygous tall plant with a homozygous recessive plant, what is the phenotypic ratio

• 4:0

• 2:2:0

• 0:4

• 0:2:2

Tags

NGSS.HS-LS3-1

In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?

• 0%
• 25%
• 50%
• 75%

Tags

NGSS.HS-LS3-3

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

• 0 BB: 2 Bb: 2 bb

• 1 BB: 2 Bb: 1 bb

• 2 BB: 0 Bb: 2 bb

• 2 BB: 1 Bb: 0 bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

A homozygous dominant round seeded plant is crossed with a homozygous recessive wrinkled seeded plant. What are the genotypes of the parents?

• RR X rr
• Rr X rr
• rr X rr
• RR X Rr

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Albinism is an autosomal recessive condition. Which circle graph shows the genotype probability when an albino female mates with a male that is heterozygous for the albinism trait?

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Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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 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

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?

• 1 BB: 2 Bb: 1 bb

• 0 BB: 2 Bb: 2 bb

• 2 BB: 0 Bb: 2 bb

• 2 BB: 1 Bb: 0 bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

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 of the offspring can be expected to have frizzled feathers?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3