Question 1 The picture shows domestication of wild apple. The way man has done t

Question

Question 1

The picture shows domestication of wild apple. The way man has done this is:

A)grow apples with better growing conditions every generation. The larger apple size phenotype is genetically inherited and is passed on to the next generation

B) a spontaneous mutation produced a tree with very large apples and man was smart enough to pick the apple and save the seed

C) apple trees have a selective pressure to produce bigger and bigger apples over the years because larger apples are better for seed dispersal (and man reaped the benefit

D) genetic changes can cause small increases in fruit size. If man harvests the seed from such fruit, he can gradually increase fruit size over a long time period

Question 2

If man were to go extinct, predict what would happen to the domestic apple in 10,000 years

A) apple species would go extinct soon after man because apples need man to pick the apples to propagate the seed

B) apples would gradually return to their small undomesticated state because man would not be tending the trees water and mineral deficiencies would change the DNA to make the apples smaller and smaller with each generation

C) apples would gradually return to their small undomesticated state because no selection pressure for large apples is being applied and small apples are better for the plant

D) Apples would stay the same size becuase once a trait has evolved it is genetically fixed.

Explanation / Answer

Question 1

The answer to the question is

D) Genetic changes can cause small increases in fruit size. If man harvests the seed from such fruit, he can gradually increase fruit size over a long time period

Evidence has shown that apple species have evolved to bigger fruits by small genetic changes. Other mammals such as bears, horses and other animals have acted as distributors of bigger and juicier fruit seeds making the species of bigger fruit more prominent.

Humans have smartly cultivated them through agriculture and made apple to evolve to bigger size.

Question 2

If man goes extinct,

B) Apples would gradually return to their small undomesticated state because man would not be tending the trees water and mineral deficiencies would change the DNA to make the apples smaller and smaller with each generation

This is because it is humans that have smartly cultivated the wild apples into large size. Without man, the apples would gradually come back to their original wild forms.

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