Mendelian Monohybrid and Dihybrid Crosses

Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What will be the phenotypes of the offspring?

• 100% tall
• 50% tall, 50% short
• 75% tall, 25% short
• 25% tall, 75% short

In sheep, the allele for belly fur (A) is dominant to the allele for no belly fur (a): Two sheep with no belly fur mate and produce offspring. What is the percent chance that the offspring will have belly fur?

• 0%

• 25%

• 50%

• 75%

• 100%

Characteristics such as a widow’s peak or attached earlobes are determined by the genetic code. Which components of DNA are referred to as the genetic code?

• Phosphate groups
• Nitrogenous bases
•  Deoxyribose sugars
• Hydrogen bonds

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

What is the probability of a purple-horned unicorn if a heterozygous pink-horned unicorn is crossed with a heterozygous pink-horned unicorn?

• 0%
• 25%
• 50%
• 75%

Tags

NGSS.MS-LS3-2

• A

• B

• C

• D

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What gamete possibilities could come from this parent's genotype?

• AB, AB, aB, aB
• Ab, AB, Ab, ab
• Ab, Ab, Ab, Ab
• AB, aB, ab, aB

Tags

NGSS.HS-LS3-1

A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.

This cross would be

• BBEE x bbee

• BBEe x BbEe

• BbEE x BbEe

• BBee x BBEE

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb?

• 12.5% (2/16)

• 25% (4/16)

• 50% (8/16)

• 75% (12/16)

A characteristic that an organism can pass on to its offspring through its genes is ___________

• Trait
• Gene
• Allele
• Dominant

Tags

NGSS.MS-LS3-2

An organism’s physical appearance, or visible traits. 

• Genotype
• Phenotype
• Beanotype
• Notype