Punnett Squares

In pea plants, Mendel found that tall plants  and yellow seeds are both dominant. The  phenotype for a pea plant with the genotype  TtYy would be —

• Tall and Yellow
• Tall and Green
• Short and Yellow
• Short and Green

In a plant that has red flowers, red flower color, R, is completely dominant to white  flower color, r. If the plant is heterozygous for  flower color, which alleles will be  carried by the gametes it produces? 

• R and r
• R only
• r only

What ratio of the offspring from the cross shown will be homozygous recessive for the  trait of tallness? 

• 0 in 4
• 1 in 4
• 2 in 4
• 4 in 4

In squash plants, yellow fruit (Y) is dominant  to white fruit (y). If two plants  heterozygous for yellow fruit are crossed,  what are the possible genotypes of the  offspring?

• YY, Yy
• Yy
• YY, yy
• YY, Yy, and Yy

Red flower color is dominant to white flower  color in rose plants. What is the  expected result of a cross between two heterozygous rose plants?

• 100% red
• 75% red, 25% white
• 50% red, 50% white
• 75% white, 25% red

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

If two pea plants are crossed and one is homozygous tall and the other is short, what is the probability that the offspring are short? (Tall is Dominant)

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

If a baby was born with green eyes, but his mother had blue eyes, is it possible that the baby's father had blue eyes? (Blue is dominant)

• Yes

• No

A tall plant (TT) is crossed with a tall plant (Tt).  What is the genotypic ratio?

• 2 TT: 2 Tt
• 1 TT: 2 Tt
• 2 TT: 1 Tt : 1 tt
• 4 tt : 0 other

Tags

NGSS.HS-LS3-3

A green pea plant (GG) is being crossed with a green pea plant (Gg). What is the phenotypic ratio?

• 100 % rainbow 
• 50% yellow and 50% green 
• 100% green
• 100% yellow 

Tags

NGSS.HS-LS3-1

Two heterozygous red flower (white flowers are recessive) are crossed. What is the phenotypic ratio?

• 75% red and 25% white
• 25% red and 75% white
• 100 White 
• 50% red 50% red