Genetics and Punnett Square Review

Gregor Mendel developed some basic principles of heredity by ______________.

• breeding fruit flies

• cutting off the tails of mice

• crossing pea plants

• growing bacteria in a laboratory

Which term correctly describes an individual with a pair of the same alleles for a trait? 

• homologous

• heterozygous

• homozygous

• heterologus

An individual with two different alleles for a specific trait is said to be _____________.

• homozygous

• heterogenous

• homogenous

• heterozygous

What is the phenotype for the recessive trait?

• brown eyes

• green eyes

• blue eyes

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

Fill in the missing genotypes

a

b

BB

bB

Bb

bb

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

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 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 - bottom row

T T

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Select the boxes in the Punnett Square where you would find heterozygous offspring.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2