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4. You are studying two different genes and each gene has two alleles. Each allele is either completely dominant or recessive. You cross one parent that is homozygous recessive with a parent that is heterozygous for both genes, and observe four phenotypic classes in a ratio of 1:1:1:1. You conclude that:A. The genes may or may not be on the same chromosome.B. The genes can only be on different chromosomes.C. The genes can only be on the same chromosome.D. You can't tell if these genes are linked because crossing-over might have occurred between sister-chromatids during anaphase II.

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