Unit 3 (SC.7.L.16.2, SC.7.L.16.4)

Which of these choices describes the purpose of a Punnett square?

• to diagram family relationships that include several generations

• to explain why some genes are recessive and others are dominant

• to compare inherited traits to acquired traits

• to illustrate how the alleles of parents might be passed on to their offspring

Carrie is studying the genes of two fruit flies in her lab. She knows what alleles they have. She wants to know the potential combinations of alleles their offspring could inherit. Which of these choices would help Carrie identify the potential combinations?

• an allele

• a carrier

• a pedigree

• a Punnett square

On a Punnett square, what do the letters at the top and left side represent?

• The letters at the top represent alleles of the parents. The letters on the left represent alleles of the offspring.

• The letters at the top represent alleles of the male offspring. The letters on the left represent alleles of the female offspring.

• The letters at the top represent alleles of one parent. The letters on the left represent alleles of the other parent.

• The letters at the top represent alleles of the female offspring. The letters on the left represent alleles of the female parent.

Which of these choices gives the correct ratio for the offspring predicted by the diagram?

• 2 BB : 1 Bb

• 1 BB : 1 BB

• 2 BB : 2 Bb

• 1 BB : 2 Bb

Which of these choices should be placed in the box with the question mark?

• AA

• Aa

• aa

• AA or aa, but not possible to determine which one

The parents in the diagram above have which of these alleles?

• DD and Dd

• Dd and Dd

• Dd and dd

• DD and dd

Which of these choices best describes probability?

• a comparison that shows the relationship between quantities

• the most likely outcome of a given cross

• how likely a given outcome will happen compared to all possible outcomes

• a way to calculate exactly which alleles an offspring will inherit from its parents

Anya and Greg are working in their research laboratory. Anya tells Greg that one of the mice has a 50% probability of having the alleles DD and a 50% probability of having the alleles Dd. What does Anya mean by this?

• In two out of 50 times, the mouse has the alleles DD or Dd.

• The probability that the mouse has the alleles DD is equal to the probability that it has the alleles Dd.

• The mouse is twice as likely to have the alleles DD than it is to have the alleles Dd.

• There are two more possible outcomes besides the mouse having DD or Dd alleles.

Which of these statements is correct according to the diagram?

• Each offspring has a 25% probability of inheriting the alleles PP.

• Each offspring has a 25% probability of inheriting the alleles Pp.

• Each offspring has an equal probability of inheriting the alleles PP or Pp.

• Each offspring is more likely to inherit pp than any other combination of alleles.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Which of these choices best describes a pedigree?

• an illustration that shows the genetic diversity among different species

• a hypothesis that explains why genes are recessive or dominant

• a diagram of family relationships that includes several generations

• a diagram that lists alleles of two parents and shows the possible allele combinations of their offspring