What Evidence Did Alfred Sturtevant Use to Support His Conclusion

Multiple Choice

What evidence did Alfred Sturtevant use to support his conclusion that Drosophila have four pairs of chromosomes?

A) All of the genes he identified had a recombination frequency of 50%.
B) Drosophila genes cluster into four distinct groups of linked genes.
C) The overall number of genes in Drosophila is a multiple of four.
D) All of the genes he identified had recombination frequencies of less than 50%.