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SUMMARY
- The inheritance patterns of two traits is
studied in dihybrid crosses.
- The first step to solving a dihybrid cross is
to see how the alleles of each trait could possibly
combine during gamete formation.
- The next step is to use a Punnett square to determine
how these gametes could combine to form offspring
(F2 generation).
- The phenotypes (black, short, and so on) can be
determined after the genotypes of the offspring
(BbSs, and so on) are determined.
- A 9:3:3:1 phenotypic ratio was determined
for this particular cross. The 9:3:3:1 ratio
is typical for a dihybrid cross between two
heterozygous individuals (BbSs X BbSs).
Activity
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to Part 3
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