Question

question #18
examine the list.

1. skin disease because of excessive exposure to sunlight
2. ability to play basketball because of practicing on a team
3. hair baldness because of a family history of baldness
4. preference for rock music because parents’ favorite type is rock music
5. long eyelashes because of dominant alleles on a gene

which characteristics in the list are inherited?
a 1 and 3
b 1 and 5
c 2 and 4
d 3 and 5
question #19
the table provides information about two inherited traits in plants, stem height and flower color.
allele | trait
t | tall stem
t | short stem
r | red flower
r | white flower
what can be inferred about a plant with the genotype rr?
a the red - flowered plant inherited a dominant allele from both parents.
b the white - flowered plant inherited a recessive allele from both parents.
c the red - flowered plant inherited a dominant allele from one parent and a recessive allele from the other parent.
d the white - flowered plant inherited a dominant allele from one parent and a recessive allele from the other parent.

Explanation:

Question #18

Inherited characteristics are those passed down through genes/family history.

• 1: Skin disease from sun exposure is environmental (not inherited).
• 2: Basketball ability from practice is acquired (not inherited).
• 3: Hair baldness with family history is inherited (genetic).
• 4: Music preference from parents’ taste is cultural/learned (not inherited).
• 5: Long eyelashes from dominant alleles is inherited (genetic).

So inherited are 3 and 5.

• Genotype \( Rr \): \( R \) is dominant (red flower), \( r \) is recessive (white flower).
• \( Rr \) means one dominant (\( R \)) and one recessive (\( r \)) allele, inherited from each parent.
• A: \( Rr \) doesn’t come from two dominant alleles (needs \( RR \) for that).
• B: White flower needs \( rr \), not \( Rr \).
• C: \( Rr \) has one \( R \) (dominant, from one parent) and one \( r \) (recessive, from the other) – correct.
• D: White flower needs \( rr \), so \( Rr \) can’t be white - flowered.

Answer:

D. 3 and 5

Question #19