║⊕QUESTION⊕║
'' We all know interspecies linking together is weird''
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CLASS 12
PRINCIPLES OF INHERITANCE AND VARIATION
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In a dihybrid cross of the fruitfly, the recombination % is much higher. Justify
the reason and explain it with the help of a cross.
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Explanation:
dihybrid cross determines the allele combinations of offspring for two particular genes that are unlinked (not on the same chromosome)
Because there are two genes with two alleles per gene (multiple alleles not required), there can be up to four different gamete combinations
To work out gamete combinations remember FOIL:
• First (AaBb = AB) • Outside (AaBb = Ab) • Inside (AaBb = aB) • Last (AaBb = ab)
When calculating genotype, always pair alleles from the same gene (e.g. ABab should be AaBb) and always write capitals first