Genetics Review 2

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

• recessive
• dominant
• lower case letter
• both 

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

NGSS.HS-LS3-3

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

• 0%
• 25%
• 50%
• 75%

Tags

NGSS.HS-LS3-3

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-LS3-3

In the punnett square shown, what is the genotypes of the two parents?

• RW and RR
• RW and WW
• RR and WW
• RW and RR

Tags

NGSS.HS-LS3-1

Which of the following is a phenotype?

• Aa
• black hair
• heterozygous genes
• mutated DNA

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Dominant or recessive?
tt

• Dominant 
• Recessive

Tags

NGSS.HS-LS3-1

What is a dominant allele?

• A trait that is always shown (capital letter)
• A trait that can be hidden (lower case letter)
• Alleles that are the same
• Alleles that are different

Tags

NGSS.HS-LS3-1