Question: In maize, two plants that are both heterozygous for the recessive alleles a and b are crossed. What frequency of double-mutant progeny will appear if a and b are 7.2 map units apart, and both parents carry a and b in repulsion (trans)?

Question: Why are the cells of the stratum basale used to create induced pluripotent stem (iPS)cells? What characteristics make them good candidates for this over ther cell types?