In the previous question you identified the pattern of inheritance that the "thumb gene" follows. Which of the following pieces of evidence is the best support for your claim? 1.a mother with a normal thumb and a father with a Hitchhiker’s thumb have kids with intermediate thumbs (somewhat bent, but not much)
2. a mother with a normal thumb and a father with a normal thumb have kids with one normal thumb and one Hitchhiker's thumb
3. there are 2 possible phenotypes of thumbs
4. there are 3 possible phenotypes of thumbs

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.