Genetic drift is the in allele frequencies from generation to generation and is especially influential in populations.
a) change due to selection; small
b) random change; small
c) change due to selection; large
d) random change; large

B) random change; small

Explanation:

Genetic drift refers to the change in the allele frequencies of a population by a chance event. It does not include natural selection for adaptive features. Genetic drift occurs when accidental and chance events change the allele frequencies of the population. It is more effective in small populations which in turn are more likely to exhibit sampling or handling errors.

Genetic drift tends to fix an allele irrespective of its harmful, beneficial or neutral effect on the population and thereby, increases homozygosity in the population. The population exhibits lesser genetic variations. For example, the founder effect is a genetic drift that occurs when a few individuals from the original population colonize new habitat.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.