Answer:
D) four
Explanation:
When doing a dihybrid cross, it's assumed that there is two alleles for each gene. Two traits requires two genes, and two genes requires four alleles, or "letters"
The genotypes of the parents require ( D ) : Four
A two-trait cross ( dihybrid ) is a cross between 2 individuals who are heterozygous at 2 loci
example of a two-trait cross
dihybrid cross between Tall plants with Brown flowers
genotype for each plant ( heterozygous ) = TtBb
Therefore the cross = TtBb * TtBb
where : T ( tall ) = dominant
t ( dwarf ) = recessive
B ( brown ) = dominant allele
b ( white ) = recessive
Hence the parents genotypes will require 4 letters ( TtBb * TtBb )
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