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Oat sample test question

Doc2020IE

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35. several generations of 2 species of paramecia are observed reproducing at the same rate. It is noted that population A has fewer phenotypes over time than population B, This most likely would occur if population B

A has more surviving offspring
B. has fewer individuals with recessive alleles
C. reproduces asexually
D. reproduces sexually.
E. Has individuals with greater fitness.

Answer is D...but, Anyone can explain this question more? PLEASE~~:D
 

xshinigami

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35. several generations of 2 species of paramecia are observed reproducing at the same rate. It is noted that population A has fewer phenotypes over time than population B, This most likely would occur if population B

A has more surviving offspring
B. has fewer individuals with recessive alleles
C. reproduces asexually
D. reproduces sexually.
E. Has individuals with greater fitness.

Answer is D...but, Anyone can explain this question more? PLEASE~~:D
The answer should be D because more phenotypes indicate recombination of genetic material.
 

Jaesango

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to add to the poster's answer above. it is because paramecia can undergo sexual or asexual reproduction. It is often triggered by environments that are either very harsh or very optimal for growth. (usually the first).
Thereby, allowing sexual reproduction allows recombination of genes rather than in type A which only utilizes asexual reproduction so the variability of the genes in the population does not increase.
 

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