6Q If you cross two individuals that are pure breeders for phenotypic characteristics at the extremes of the phenotypic range, what does the F1 look like?
1. It would be in the mid range
2. It would lie to the side of the
dominant genes
3. You would get a normal curve
4. You would get a Poisson curve
5. None of the above
CORRECT! In any population arising from a cross between extreme phenotypes (quantitative inheritance) the F1 will be heterozygous for each allele and hence display an intermediate phenotype. Normal distributions, assuming no selection acting for or against a gene, will not be seen until the F2. If factors favor a particular genotype range over others, then a Poisson distribution will be seen.