Genetics Review

Heterozygous alleles would be:

• one capital letter, one lowercase
• two capital letters
• two lower-case letters
• two dominant alleles

Which one is homozygous dominant?

• Rr
• RR
• rr
• rR

Which is an example of a phenotype?

• brown eyes
• BB
• Bb
• 3:1

Recessive alleles are represented by:

• a ratio
• a percentage
• capital letters
• lower-case letters

If T = tall and t = short, what alleles will a short person have?

• tt
• TT
• tT
• Tt

What is a gene?

• An entire chromosome that  codes for a trait
• a piece of clothing
• a piece of a DNA on chromosome that codes for a trait
• Chemical messengers in your brain that code for a trait

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

What is a recessive 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

Homozygous or heterozygous?
BB

• Homozygous
• Heterozygous

Dominant or recessive?
tt

• Dominant 
• Recessive