Question

practice identifying dominant and recessive alleles
in 3, determine (put - it - ahead) will show either a dominant or recessive trait. choose the trait that each genotype will show
to reference: \match the same on dominance and phenotypes\ or the video on dominant and recessive alleles
(then there are several genotype boxes (like aa, tt, aa, etc.) connected with lines to trait descriptions, and buttons for dominant and recessive at the bottom, along with page numbering 1,2,3,4,5,6,7,8,9 and a current page 4 indicator)

Explanation:

To determine the trait (dominant or recessive) for each genotype, we use the rule of dominance in genetics: a dominant allele (represented by a capital letter) will express its trait even if only one copy is present (heterozygous or homozygous dominant), while a recessive allele (represented by a lowercase letter) will only express its trait when two copies are present (homozygous recessive).

Step 1: Analyze \( AA \)

The genotype \( AA \) has two dominant alleles. By the rule of dominance, a homozygous dominant genotype shows the dominant trait.
So, \( AA \) shows the dominant trait.

Step 2: Analyze \( Tt \)

The genotype \( Tt \) has one dominant (\( T \)) and one recessive (\( t \)) allele. Since the dominant allele is present, the dominant trait is expressed.
So, \( Tt \) shows the dominant trait.

Step 3: Analyze \( aa \)

The genotype \( aa \) has two recessive alleles. By the rule of recessive expression, a homozygous recessive genotype shows the recessive trait.
So, \( aa \) shows the recessive trait.

Step 4: Analyze \( Bb \)

The genotype \( Bb \) has one dominant (\( B \)) and one recessive (\( b \)) allele. The dominant allele is present, so the dominant trait is expressed.
So, \( Bb \) shows the dominant trait.

Step 5: Analyze \( bb \)

The genotype \( bb \) has two recessive alleles. Thus, the recessive trait is expressed.
So, \( bb \) shows the recessive trait.

Step 6: Analyze \( Ii \)

The genotype \( Ii \) has one dominant (\( I \)) and one recessive (\( i \)) allele. The dominant allele is present, so the dominant trait is expressed.
So, \( Ii \) shows the dominant trait.

Step 7: Analyze \( SSS \)

The genotype \( SSS \) has three dominant alleles (all \( S \), which is dominant). So, the dominant trait is expressed.
So, \( SSS \) shows the dominant trait.

Step 8: Analyze \( UZz \)

Assuming \( U \) and \( Z \) are alleles (maybe a typo, but if \( U \) is dominant and \( Z \) is recessive, but with two \( z \)s? Wait, maybe it's a typo, but if we consider the dominant allele \( U \) is present (one \( U \)), then the dominant trait is expressed. Alternatively, if it's a homozygous for some, but likely \( U \) is dominant, so \( UZz \) (with \( U \)) shows dominant.
So, \( UZz \) shows the dominant trait (assuming \( U \) is dominant).

Step 9: Analyze \( iii \)

The genotype \( iii \) has three recessive alleles (all \( i \), recessive). So, the recessive trait is expressed.
So, \( iii \) shows the recessive trait.

Step 10: Analyze \( UUu \)

The genotype \( UUu \) has two dominant (\( U \)) and one recessive (\( u \)) allele. The dominant alleles are present, so the dominant trait is expressed.
So, \( UUu \) shows the dominant trait.

Step 11: Analyze \( hhh \)

The genotype \( hhh \) has three recessive alleles (all \( h \), recessive). So, the recessive trait is expressed.
So, \( hhh \) shows the recessive trait.

Answer:

• \( AA \): Dominant
• \( Tt \): Dominant
• \( aa \): Recessive
• \( Bb \): Dominant
• \( bb \): Recessive
• \( Ii \): Dominant
• \( SSS \): Dominant
• \( UZz \): Dominant (assuming \( U \) is dominant)
• \( iii \): Recessive
• \( UUu \): Dominant
• \( hhh \): Recessive

(Note: For \( UZz \), if there was a typo and the intended genotype was different, the analysis might change, but based on standard dominance rules with the given alleles, this is the conclusion.)