Punnett Squares & Pedigrees

Which of the following correctly states the genotype probabilities for the offspring of the parents shown in this punnett square?

• 50% heterozygous 50% homozygous dominant

• 50% heterozygous 50% homozygous recessive

• 50% heterozygous 25% homozygous recessive 25% homozygous dominant

• 100% heterozygous

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following correctly states the genotype probabilities for the offspring of the parents shown in this punnett square?

• 50% heterozygous 50% homozygous dominant

• 50% heterozygous 50% homozygous recessive

• 50% heterozygous 25% homozygous recessive 25% homozygous dominant

• 100% heterozygous

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If B = brown hair and b = blonde hair, what is the probability of brown hair?

• 25%

• 50%

• 0%

• 75%

Tags

NGSS.HS-LS3-3

In certain species of plants, purple flowers (P) are dominant to white flowers (p). If two heterozygous plants are crossed, what will be the phenotype of the offspring?

• 100% purple flowers

• 100% white flowers

• 75% white flowers, 25% purple flowers

• 25% white flowers, 75% purple flowers

Tags

NGSS.HS-LS3-1

According to this Punnett square​ (a)   of the offspring will be homozygous dominant, ​ (b)   Of the offspring will be heterozygous, and the remaining 25% will be homozygous ​ (c)   . As for the phenotypes, ​ (d)   of the flowers will be ​ (e)   .

• 25%

• 50%

• recessive

• 75%

• pink

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

T - tall and t = short. In the Punnett square below, what belongs in the missing square (a)  

• tt

• Tt

• Bb

• TT

Fill in the missing genotypes

a

b

bb

BB

bB

Bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

According to this Punnett square ​ (a)   Of the offspring will be homozygous dominant, ​ (b)   Of the offspring will be heterozygous, and the remaining 25% will homozygous ​ (c)   . As for the phenotypes, ​ (d)   Of the flowers will be ​ (e)   .

• 25%

• 50%

• recessive

• 75%

• pink

• 100%

• White

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Complete the punnett square

a

b

c

d

T t - bottom row

t t

T t - top row

T T

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the probability of a purple-horned unicorn if a heterozygous pink-horned unicorn is crossed with a heterozygous pink-horned unicorn? (a)  

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3