Unit 9 Study Guide Review

Letters that represent different forms of the gene.

Dominant Allele: A
Recessive Allele: a

​Alleles

​The combination of alleles (letters).

Homozygous Dominant: AA Homozygous Recessive: aa
Heterozygous: Aa

Genotype

This is the physical appearance of a trait.

What does it look like?

AA - Dominant trait expressed
Aa - Dominant trait expressed
aa - Recessive trait expressed

Phenotype

Fill in the Blanks

AA

Word Bank: Homozygous, Heterozygous, Recessive Allele, Phenotype, Trait, Dominant Allele

Fill in the Blanks

P

Homozygous, Heterozygous, Recessive Allele, Phenotype, Trait, Dominant Allele

Fill in the Blanks

Eye Color

Homozygous, Heterozygous, Recessive Allele, Phenotype, Trait, Dominant Allele

Fill in the Blanks

Aa

Homozygous, Heterozygous, Recessive Allele, Phenotype, Trait, Dominant Allele

Fill in the Blanks

Sharp Teeth

Homozygous, Heterozygous, Recessive Allele, Phenotype, Trait, Dominant Allele

Fill in the Blanks

b

Homozygous, Heterozygous, Recessive Allele, Phenotype, Trait, Dominant Allele

Multiple Choice

What genotype belongs in the empty square?

• bb

• BB

• Bb

• Not enough information

Fill in the Blanks

What is the genotype is in the missing square?

Multiple Choice

Predict the potential genotypes and phenotypes (curly & straight hair) resulting from a cross between 2 parents.  One is homozygous dominant with straight hair & the other is heterozygous.  What percentage of offspring will have straight hair?

• 50%

• 25%

• 100%

• 75%

Multiple Choice

Predict the potential genotypes and phenotypes (curly & straight hair) resulting from a cross between 2 parents.  One is homozygous dominant with straight hair & the other is heterozygous.  What percent will have a homozygous recessive genotype?

• 25%

• 50%

• 0%

• 75%

Multiple Choice

Mr. Krabbs is heterozygous for his tall eyeballs, while his wife has short eyeballs.  What is the probability that their children having a heterozygous genotype?

• 0%

• 50%

• 25%

• 100%

Multiple Choice

Mr. Krabbs is heterozygous for his tall eyeballs, while his wife has short eyeballs. What is the probability of having a homozygous dominate genotype?

• 0%

• 25%

• 50%

• 7

Fill in the Blanks

What genotype belongs in the box labeled with an X?

Multiple Choice

Which genotype(s) belong in box Y?

• Ee

• ee

• EE

• EE or Ee

Fill in the Blanks

What genotype should be in box Z?

Multiple Choice

How many generations are shown in this pedigree?

• 1
• 2
• 3
• 4

Multiple Choice

What do half colored symbols represent?

• The individual is a carrier (heterozygous).
• The individual expresses the trait.
• The individual has both recessive alleles.
• The individual has both dominant alleles.

Multiple Choice

What does an open circle represent?

• Not Affected Male
• Not Affected Female
• Affected Male
• Affected Female

Multiple Choice

In the second generation-how many people are carriers of the trait?

• 2
• 3
• 5
• 6

Multiple Choice

How many people in this whole pedigree have the trait/disease?

• 2
• 3
• 4
• 6

Multiple Choice

If a trait SKIPS a generation, it is an indication that the trait is....

• dominant
• recessive
• incompletely dominant
• co-dominant

Multiple Choice

What does a horizontal line between a square and a circle mean?

• They are siblings
• They are cousins
• They are married ("together")
• They are the children

Multiple Choice

Objective #13

This is a pedigree that follows blue eyes which is a recessive trait. What is the phenotype of the mother (circle) in generation 1?

• Brown

• Blue

• 1 blue, 1 brown

Multiple Choice

Is this trait (the shaded individuals) dominant or recessive?

• dominant
• recessive

Multiple Choice

How are individuals III-2 and II-4 related?

• Brother and sister

• Dad and daughter

• Uncle and niece

• Grandfather and granddaughter

Multiple Choice

What is the mode of inheritance shown here?

• Recessive because it "skips" a generation

• Dominant because it shows up in every generation