A dihybrid test cross results in a recombination frequency of 50%. Most likely the two genes under consideration:
1. | are closely linked on the same autosome |
2. | are located on heterologous chromosomes |
3. | are present on the X chromosome |
4. | are located on the same chromosome, one on either side of the centromere |
An individual with c and d genes was crossed with the wild type ++. On test crossing F1, the progeny were +c 105, +d 115, cd 880 and ++900. Distance between c and d genes is:
1. | 11 map units | 2. | 5.5 map units |
3. | 44 map units | 4. | 22 map units |