Question

why do some animals change coat color between winter and summer?

a seasonal environmental changes alter gene expression
b their dna mutates seasonally
c they grow new chromosomes for each season
d their diet influence gene expression

question 12
drug use causing premature aging is an example of...

a a chromosomal abnormality
b a mutation inherited from parents
c an environmental influence on traits
d a trait controlled only by dna

question 13
why can identical twins raised in different environments develop differences in appearance and outcomes?

a their dna sequences slowly diverge
b different blood types emerge from diet
c environmental factors activate or silence different genes
d they each lose chromosomes over time

Explanation:

Question (about animal coat color change):

• Option a: Seasonal environmental changes (like temperature, light) can trigger changes in gene expression, leading to coat color change.
• Option b: DNA mutations are rare and not seasonal in a controlled way for coat color change.
• Option c: Animals don't grow new chromosomes seasonally; chromosomes are stable.
• Option d: Diet doesn't directly influence gene expression for coat color change in a seasonal, consistent way as environmental changes do.

• Option a: Drug use doesn't cause chromosomal abnormalities related to aging.
• Option b: Premature aging from drugs isn't an inherited mutation.
• Option c: Drug use is an environmental factor (behavioral/environmental choice) that influences traits (aging).
• Option d: Aging from drugs isn't controlled only by DNA, as it's an environmental influence.

• Option a: Identical twins have the same DNA sequence; it doesn't diverge.
• Option b: Diet doesn't change blood types.
• Option c: Environmental factors (like diet, stress, exposure) can activate or silence genes, leading to trait differences.
• Option d: Chromosomes aren't lost over time in a way that causes twin differences.

Answer:

a. Seasonal environmental changes alter gene expression

Question 12 (Drug use and premature aging):