Punnett Square Review

In guinea pigs, smooth coat (S) is dominant over rough coat (s).  If an SS guinea pig is crossed with an ss guinea pig, what ratio of guinea pigs in the offspring would you predict?

• 75% will have smooth coats, and 25% will have rough coats
• All offspring will be Ss and have smooth coats
• Half the offspring will be SS, and the other half will be ss
• All offspring will be Ss and have rough coats

Tags

NGSS.HS-LS3-1

Use a Punnett square of a Bb x Bb cross.  B is the factor for brown eyes, and b is the factor for blue eyes.  What percent of offspring from these parents will have blue eyes?

• 25%
• 50%
• 0%
• 100%

Tags

NGSS.HS-LS3-3

In peas, yellow seeds (Y) are dominant over green seeds (y).  If a yy plant is crossed with a YY plant, what would the ratio of plants in the offspring predict?

• All offspring will be Yy.  100% will be yellow
• 75% will have yellow seeds (YY, Yy, yY), and 25% will have green seeds (yy)

Tags

NGSS.HS-LS3-1

Use a Punnett square of Bb x Bb cross. B is the factor for brown eyes, and b is the factor for blue eyes. If we say that blue eyes are recessive...What will be the alleles for a blue-eyed person?

• Bb

• cannot be determined from the information given

• BB

• bb

A Punnett square is used to depict the potential offspring from a cross

• true
• false

If two parents who are homozygous recessive for a certain trait are crossed, what is the probability of having a child who does not have their traits?

• 25%
• 100%
• 50%
• 0%

A ________ is a chart that allows you to easily determine the expected percentage of different genotypes in the offspring of two parents.

• mitosis
• meiosis
• Punnett Square
• Genotype

Squarepants is dominant to roundpants. If a heterozygous squarepants and a roundpants has a baby...What is the chance in percent that the baby will be squarepants?

• 0%

• 25%

• 50%

• 75%

If color in dragons shows incomplete dominance, what would be the possible results for the offspring of 2 heterozygous green dragons (GG' x GG')? Remember Blue dragons are (GG) and Yellow dragons are (G'G')!

• 100% green

• 0% blue, 50% green, 50% yellow

• 25% blue, 50% green, 25% yellow

• 50% blue, 50% green, 0% yellow

In some cattle the genes for brown hair (BB) and white hair (WW) are co-dominant. Cattle with both alleles have both brown and white hairs. This combination gives the cattle a reddish color called "roan". What are the phenotypes of the offspring of a roan cow (BW) and a white (WW) bull?

• 50% White, 50% Brown

• 25% Brown, 50% Roan, 25% White

• 50% White, 50% Roan

• 0% Brown, 75% Roan