Punnett Square Practice

Which letters should replace the ??

• aa

• AA

• Aa

Answer explanation

Remember to bring one letter down from the top, and one letter from the side.

Which letters should replace the ??

• DD

• dD

• dd

• Dd

Answer explanation

Remember to take one letter from the top and one letter from the side.

Which letter should replace the ?

• r

• R

• Rr

• RR

Answer explanation

Review the picture provided.

Tags

NGSS.MS-LS3-2

Which letter should replace the ??

• Qq

• qq

• QQ

Answer explanation

Remember to take one letter from the top (Q) and one letter from the side (q).

Which letter should replace the ??

• ff

• FF

• Ff

Answer explanation

Remember to take one letter from the top (f) and one letter from the side (f).

Which letter should replace the ??

• Nn

• nn

• NN

Answer explanation

Remember to take one from the top (n) and one from the side (N). Also, the dominant letter ALWAYS goes first!

Tags

NGSS.MS-LS3-1

NGSS.MS-LS4-4

Based on the Punnett Square, what are the possible genotypes of the offspring?

• Bb and bb

• bb, Bb, and bb

• bb only

• Bb only

Answer explanation

See the solved punnett square provided. There are TWO Bb and TWO bbs.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which word best describes the offspring's possible genotypes?

• all are heterozygous

• all are homozygous

• all are homozygous recessive

• all are a mixture of homozygous and heterozygous

Answer explanation

The offspring's possible genotypes are all heterozygous because they have one dominant and one recessive allele for a particular trait.

Tags

NGSS.MS-LS3-2

Based on the Punnett Square, which term best describes the parents?

• heterozygous

• homozygous recessive

• homozygous dominant

• heterozygous recessive

Answer explanation

To answer this one compare the parents to the offspring. There are two blue offspring just like the parents. To make the blue offspring according to the punnett square it was Bb. The parents are best described as heterozygous because they have different alleles.

Tags

NGSS.HS-LS3-1

Based on the Punnett Square, which term best describes the Blue chickens?

• heterozygous

• homozygous recessive

• homozygous dominant

Answer explanation

Based on the Punnett Square, the Blue chickens are heterozygous, as they have one dominant and one recessive allele for the blue color gene.

Tags

NGSS.MS-LS3-2