BI-1549
Continuous and discontinuous variation
Biology · Secondary 4 · Hard · Continuous and discontinuous variation
A scientist measures the mass of seeds from a cross between two pure-breeding plant varieties. The offspring show a continuous range of seed masses from very light to very heavy. Which process best explains this pattern of variation?
- A single gene with two alleles showing complete dominance
- The additive effects of many genes influencing seed mass
- A mutation in one gene controlling seed mass
- Environmental factors only, with no genetic influence
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