Punnett Square Practice

In a species of flowers, red petals (R) are dominant to orange petals (r). If two plants heterozygous for red petals are crossed, what are the possible genotypes of the offspring?

• Rr only

• RR, rr only

• Rr, rr only

• RR, Rr, and rr

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Sam has two pet rabbits with gray fur. When her rabbits mated, one of their four offspring had white fur. The other three had gray fur. Which of the following conclusions is most likely true about the genotypes of Sam's rabbits?

• gg, gg

• GG, GG

• Gg, Gg

• GG, Gg

Tags

NGSS.MS-LS3-2

In corn plants, tall (T) is dominant to short (t). What are the chances of two heterozygous tall plants producing short offspring?

• one in four

• two in four

• three in four

• four in four

In sheep, the allele for white wool (W) is dominant, and the allele for black wool (w) is recessive. If a heterozygous sheep is crossed with a black sheep, what percentage of their offspring could be black?

• 100%

• 75%

• 50%

• 25%

A set of parents have two daughters and two sons. The mother has two dominant genes for straight hair and the father has two recessive genes for curly hair. Based on the parent's genes, which children have straight hair?

• only the sons

• only the daughters

• all of the children

• none of the children

In pea plants, the allele for round seeds (R) is dominant to the allele for oval seeds (r). In a cross between two plants that are both heterozygous what percentage of the offspring will have round seeds?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

One cat carries heterzygous, long-haired traits (Ss), and its mate carries homozygous short-haired traits (ss). Which of the following correctly describes the possible ratios of their offspring?

• 0 long to 4 short

• 1 long to 3 short

• 2 long to 2 short

• 3 long to 1 short

A pink tulip plant (PP) and a white tulip plant (pp) are crossed. Which of the following best describes the genotype of the offspring from this cross?

• homozygous dominant

• homozygous recessive

• heterozygous

Tags

NGSS.HS-LS3-1

In a breed of flies, red eyes (E) are dominant to black eyes (e). If a homozygous red-eyed fly (EE) is cross bred with a homozygous black-eyed fly (ee), how many different phenotypes are possible?

• 1

• 2

• 3

• 4

In a breed of chicken, the allele for brown feathers (F) is dominant to the allele for white feathers (f). In a cross between two chickens with genotypes FF & FF, what percentage of the offspring will have white feathers?

• 100%

• 75%

• 50%

• none of the above