it is a true or false question please help! Consider the example of sickle-cell
ID: 73406 • Letter: I
Question
it is a true or false question please help!
Consider the example of sickle-cell anemia and the allele for the sickle-cell trait, and answer questions 1-3.
1. Eventually, natural selection will typically result in the sickle-cell allele being fixed in the population . .
2. Selection at this locus is an example of disruptive selection .
3. Hypothetically, if homozygous recessives had the highest fitness (i.e. selection was directional) of the three genotypes discussed in the text, then natural selection would lead to fixation of the sickle-cell allele .
4. If evolution occurs in a population, then the allele frequencies in that population must have been changed .
5. Fermentation yields an equivalent amount of energy as respiration because both processes achieve full oxidation of carbon compounds to CO2 . 6. Natural selection is not involved in adaptive radiation .
7. Many antibiotics that target protein synthesis in bacteria are ineffective against archaea .
8. Farmers plant soybeans to regenerate nitrogen nutrients in soils because soybean roots have nodules that can fix nitrogen .
9. Chemoautotrophy is a uniquely prokaryotic metabolism .
10. While the gene encoding the small subunit of ribosomes was used to generate the universal tree of life, many genes are inappropriate choices for this analysis because horizontal gene transfer has occurred for billions of years between the ancestors giving rise to all three domains .
Explanation / Answer
Answer 4: True
Evolution leads to change in gene pool, so yes we can say allele frequencies will be affected.
Answer 5: False
Fermentation yields lesser amount of energy as it leads to incomplete break down of carbon molecules.
Answer 8: True
Leguminous plants replenish nitrogen in the soil.
Answer 9: True
Since its autotrophy, and this is function of plants only in eukaryotes, so yes chemo-autotrophy is unique to prokaryotes.
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