Which of the following is an advantage to outbreeding (cross-pollinating) strategies used by some plants?

Question

BlackTom AI · Accepted Answer

Outbreeding (cross-pollination) mixes alleles from different individuals, producing offspring with greater heterozygosity and a wider array of genetic combinations.

1) Relevant knowledge points and concepts
- Sexual reproduction via cross-pollination combines gametes from different parents, introducing new allele combinations.
- Genetic variability (heterozygosity, allelic diversity) increases the range of phenotypes in a population.
- Higher genetic variability reduces inbreeding depression and improves potential for adaptation to changing environments or pathogens.

2) Step-by-step reasoning
- Step 1: Parent A and Parent B each carry sets of alleles; cross-pollination allows recombination of these alleles in offspring.
- Step 2: Meiosis produces varied gametes; fertilization between different individuals combines different gametes, increasing possible genotype combinations.
- Step 3: The distributed genotypes yield greater phenotypic variation among offspring compared with selfing or clonal reproduction.
- Step 4: Natural selection can act on this variation, favoring genotypes suited to novel stresses (disease, climate), improving population resilience.

3) Calculations / intermediate logic
- While no numeric calculation is needed, conceptually: if Parent A has alleles A1/A2 and Parent B B1/B2, cross-pollination can produce offspring with combinations (A1B1, A1B2, A2B1, A2B2), expanding diversity vs. selfing which limits combinations.

4) Why the correct answer is correct
- "There is generally high genetic variability in offspring." directly follows from recombination and mixing of parental alleles in outbreeding. This increased genetic variation is the primary adaptive advantage of cross-pollination.

5) Why the other options are incorrect
- "These plants reproduce asexually..." is false: cross-pollination is sexual reproduction, not asexual.
- "Cross-pollination is handled by pollinators." describes a mechanism (how pollen moves), not an advantage specific to outbreeding; pollinators can assist both outcrossing and some forms of selfing.
- "Genotypes are generally preserved across generations" is characteristic of asexual reproduction or strict selfing; outbreeding mixes and changes genotypes rather than preserving them.

6) Conclusion
The best choice is "There is generally high genetic variability in offspring." This matches the provided correct answer.

Which of the following is an advantage to outbreeding (cross-pollinating) strategies used by some plants?单项选择题

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