A testcross between F1 dihybrid flies produces more offspring with both traits like those of one parent or the other than offspring with recombinant-type traits. What best explains these results?
1) Both of the characters are controlled by more than one gene.

2) Recombination did not occur in the cells during meiosis.

3) The two genes are closely linked on the same chromosome.

4) The two genes are far apart or on different chromosomes.

Question

A testcross between F1 dihybrid flies produces more offspring with both traits like those of one parent or the other than offspring with recombinant-type traits. What best explains these results?
1) 	Both of the characters are controlled by more than one gene.
	
2) 	Recombination did not occur in the cells during meiosis.
	
3) 	The two genes are closely linked on the same chromosome.
	
4) 	The two genes are far apart or on different chromosomes.