Genetics Review

Dominant or recessive?
tt

• Dominant 
• Recessive

Dominant or recessive?
Dd

• Dominant
• recessive
• neither
• homozygous

What should students use to identify the percent chance of a trait being passed down from a parent to its offspring?

• a graph
• a flow chart
• a data table
• a Punnett square

What are the possible combinations of a pea plant with the alleles PP and a male pea plant with the alleles pp.
P= purple
p= white

• all Pp
• all PP
• Pp,PP,Pp,PP
• all pp

Homozygous is when...

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

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

• 0%
• 25%
• 50%
• 75%

What is a phenotype?

• The expression of a trait; physical appearance.
• refers to the genetic makeup of an individual
• An organism that has the same genes for a trait (ex. TT or tt)
• the passing of traits from parent to offspring

Homozygous or heterozygous?
BB

• Homozygous
• Heterozygous

Which of the following is a phenotype?

• Aa
• red hair
• heterozygous
• DNA

T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt
• Tt
• Bb
• TT