Genetics/Punnet Squares

In rabbits, black fur (B) is dominant to brown fur (b). Consider the following cross between two rabbits.

What is the phenotype of the offspring in box 3?

• Brown

• Black

• A mixture of brown and black

• None of the above

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the genotype represented by the spot labeled "4"?

• Brown eyes

• Bb

• Blue eyes

• bb

Tags

NGSS.HS-LS3-2

Which of the following best describes both parents in the punnett square?

• Heterozygous

• Heterozygous dominant

• Homozygous dominant

• Homozygous recessive

Tags

NGSS.HS-LS3-1

The allele for having a bent pinky finger is dominant to the allele for having a straight pinky finger. If two people who are both heterozygous for the trait of a bent pinky finger have a child, what is the percent probability that the child will have straight pinky fingers?

• 0%

• 25%

• 75%

• 100%

Tags

NGSS.HS-LS3-3

What is the expected genotypic ratio resulting from a heterozygous x heterozygous monohybrid cross?

• 1:2:1

• 1:3:1

• 1:2

• 1:0

In a genetics laboratory, two heterozygous tall plants are crossed. If tall is dominant over short, what are the expected phenotypic results?

• 100% Tall

• 50% Tall, 50% Short

• 75% Tall, 25% Short

• 25% Tall, 75% Short

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In chickens, feather color shows codominance. A black and white spotted chicken is called "erminette."

What would be the resulting phenotypic ratio of the offspring produced in a cross between two erminette chickens?

• 1:0

• 4:0

• 1:2:1

• 1:1

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What would be the phenotype percentages of a cross between a black chicken and an erminette (black and white heterozygote) chicken?

• 50% black, 50% erminette

• 25% black, 50% erminette, 25% white

• 50% black, 50% white

• 100% black

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What are punnett squares used for?

• Predicting the possible offspring of two parents

• Determining the alleles of a specific gene

• Identifying dominant and recessive traits

• Determining an individuals genotype

In guinea pigs, the allele for rough coat (R) is dominant to the allele for smooth coat (r). A rough coat male and a smooth coat female mate. They produce MANY offspring over the years - 50% are rough coat and 50% are smooth coat. What are the most likely 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