Genetics- Monohybrid and Dihybrid Crosses

AA and Aa always show up as

• dominant

• recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Aa is

• homozygous
• heterozygous

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

Tags

NGSS.HS-LS3-1

What are the possible genotypes for this cross?

• TT = 25% Tt= 50% tt=25%
• all tall
• TT= 75% tt = 25%
• Tt = 100%

Tags

NGSS.HS-LS3-3

This is an example of a ______________.

• phenotype
• genotype
• xenotype
• base pairs

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

Chickens have different types of feathers. Frizzled feathers curl towards 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

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-LS3-2

NGSS.HS-LS3-3

T = tall an t = short
TT and Tt would result in  the following phenotype

• short
• tall
• medium sized
• neither tall or short

Tags

NGSS.HS-LS3-1

Long tongues (T) are dominant to short tongues in green tree frogs.  What is the probability that two frogs that are heterozygous for long tongues could produce offspring with short tongues?

• 100%
• 75%
• 50%
• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Mendel established the Law of Segregation. Each gamete produced by a parent contains only _______allele for a trait.

• 1

• 2

• 3

• 4

Tags

NGSS.HS-LS3-2