Two genes R and Y are located very close on the chromosomal linkage map of the maize plant. When RRYY and rryy genotypes are hybridized, then F2 segregation will show:
higher number of the recombinant types
segregation in the expected 9:3:3:1 ratio
segregation in a 3:1 ratio
higher number of the parental types
, when two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than the non-parental type due to the physical association or linkage of the genes . Genes that are 'very close' or tightly linked show very low recombination , meaning the F2 segregation will deviate from the expected 9:3:3:1 ratio in favor of parental combinations.
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