In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates:
chromosomes failed to separate during meiosis
the two genes are linked and present on the same chromosome
both of the characters are controlled by more than one gene
the two genes are located on two different chromosomes
, T.H. Morgan observed in Drosophila that when two genes in a dihybrid cross were situated on the same chromosome, the proportion of parental gene combinations was much higher than the non-parental (recombinant) type. He attributed this to the physical association or linkage of the two genes on the same chromosome . If the genes were on different chromosomes, they would assort independently, resulting in equal proportions of parental and recombinant offspring.
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