Punnett Square and Alleles

Study the Punnett Square. What is the probability of a dominant trait showing up?

• 0%

• 25%

• 50%

• 100%

Study the Punnett Square. What is the probability of having heterozygous dominant traits?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS4-3

Study the Punnett Square. What is the probability of having a recessive trait?

• 100%

• 50%

• 25%

• 0%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In alleles, capital letters show:

• Recessive traits.

• Dominant traits.

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

T t - top row

t t

T t - bottom row

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Fill in the blanks with the correct label.

e

f

g

h

d

50% Heterozygous genotype

Genotype

Dominant Allele

Parents Alleles

50% Homozygous genotype

Phenotype

Recessive Allele

Parents gamets

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Fill in the missing genotypes

a

b

BB

bB

bb

Bb

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

In a Punnett square, what do the letters outside the grid represent?

• The phenotypes of the parents

• The genotypes of the parents

• The phenotypes of the offspring

• The genotypes of the offspring