Punnett Square and Genetics Review

Homozygous is when...

• the alleles are the same
• the alleles are different
• the alleles are absent
• the alleles are present

Heterozygous is when...

• the alleles are the same
• the alleles are different
• the alleles are absent
• the alleles are present

In a DNA molecule, if there are 5 adenines, there should be _______________ thymines.

• 10
• 5
• 2.5
• cannot tell

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

• recessive
• dominant
• lower case letter
• both 

G = green, g = yellow
The genotype for a yellow plant is...

• GG
• Gg
• gg
• all of the choices result in yellow

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

T = tall an t = short
TT and Tt would result in  the following phenotype

• short
• tall
• both tall and short
• neither tall or short

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 

• 0%
• 25%
• 50%
• 75%

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

• tt
• Tt
• Bb
• TT

Tags

NGSS.HS-LS3-1

In the punnett square shown, what must the genotype of the missing parent be?

• BB
• Bb
• bb
• Tt

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

R = red and W = white  
In the RW genotype = pink
What pattern of inheritance is being shown?

• dominant/recessive
• co-domimance
• multiple alleles
• polygenic inheritance