Genetics and Punnett Squares Review

For this Punnett square, what are the chances of the offspring inheriting the Aa genotype?

• 0%

• 25%

• 50%

• 100%

For this Punnett square, what are the chances that an offspring will have a homozygous recessive trait?

• 0%

• 25%

• 50%

• 100%

For this Punnett square, which genotype will an offspring most likely inherit?

• RR

• Rr

• rr

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

• recessive
• dominant
• lower case letter
• both 

Dominant or recessive?
tt

• Dominant 
• Recessive

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 does heterozygous mean?

• An organism that has the same genes for a trait (TT or tt)
• An organism that has different genes for a trait (Tt)
• When neither gene is fully dominant; offspring is a mixture of both
• the different forms of a trait (hair color--> brown, blonde, red

An allele that is masked when a dominant allele is present. The "weaker" gene. 

• Dominant Allele
• Recessive Allele

An allele whose trait always shows up in the organism when the allele is present. The "stronger" gene. 

• Dominant Allele
• Recessive Allele

An organism’s physical appearance, or visible traits. 

• Genotype
• Phenotype
• Beanotype
• Notype