What is a main genetic risk of long-term selective breeding of a small group of animals?
Answer and explanation
Correct answer: B. Reduced genetic diversity
- Step 1: Breeding from selected parents narrows the gene pool.
- Step 2: In a small group, relatives mate more often, so harmful recessive alleles are more likely to meet in the same individual.
Answer
reduced diversity and more harmful recessive conditions.
Why not the others: Diversity decreases, not increases; mutation does not occur in every gamete; dominant alleles are not lost by this process.
Practise more Heredity and Genetic Change.
Free questions with an explanation for every one, and full timed NSW HSC mock tests.
More Heredity and Genetic Change questions
- What is the outcome of meiosis in a diploid cell that has completed both divisions?
- Crossing over during prophase I of meiosis increases genetic variation because it:
- Independent assortment in meiosis leads to genetic variation because:
- Two heterozygous tall pea plants (Tt) are crossed, with tall (T) dominant over short (t). What is the expected ratio of tall to short offspr…
- A tall pea plant of unknown genotype is crossed with a short plant. The 26 offspring are 12 tall and 14 short. What is the best conclusion?
- Two unaffected parents have a child with an autosomal recessive condition. Which statement is correct?