The recessive dumpy, dpy, mutants of the nematode worm Caenorhabditis elegans have a compact body; the...
The recessive dumpy, dpy, mutants of the nematode worm Caenorhabditis elegans have a compact body; the recessive uncoordinated, unc, mutants have defective movement coordination. When a dumpy, uncoordinated hermaphrodite (XX) is mated with a normal male (XO), the F1 male progeny all are uncoordinated and the hermaphrodites are not, but neither the males nor the hermaphrodites are dumpy. (Note: Hermaphrodites will out-cross preferentially to self-crossing.)
A. Are these genes sex-linked or autosomal? Explain for each. Use proper gene and allele notation to indicate the genotypes of the parents and the F1 of this cross.
B. If the F1 hermaphrodites are mated to the F1 males, what phenotypes of F2 progeny will result? In what frequency will each type be found?
Homework Answers
A) uncordinated gene is sex linked and dpy gene is autosomal. This is because uncordinated gene is preferrentially expressed in male which are hemizygous XO.
| Dpy XUnc | Dpy Xunc | dpy XUnc | dpy Xunc | |
| Dpy Xunc | Dpy Dpy XUnc Xunc ( normal hermaphrodite) | Dpy DpyXuncXunc( uncordinated hermaphrodite) | Dpy dpy XUnc Xunc ( normal hermaphrodite) | Dpy dpy Xunc Xunc ( uncordinated hermaphrodite) |
| Dpy O | Dpy Dpy XUnc O ( normal male) | Dpy Dpy Xunc O ( uncordinated male) | Dpy dpy XUnc O (normal male) | Dpy dpy Xunc O ( uncordinated male) |
| dpy Xunc | Dpy dpy XUnc Xunc ( normal hermaphrodite) | Dpy dpy Xunc Xunc ( uncordinated hermaphrodite) | dpy dpy XUnc Xunc ( dumpy hermaphrodite) | dpy dpy XuncXunc ( dumpy and uncordinated hermaphrodite) |
| dpy O | Dpy dpy XUnc O ( normal male) | Dpy dpy Xunc O ( uncordinated male) | dpy dpy XUnc O ( dumpy male) | dpy dpy Xunc O ( dumpy and uncordinated male) |
Normal male : 3/16
normal hermaphrodite : 3/16
uncordinated hermaphrodite: 3/16
uncordinated male: 3/16
dumpy hermaphrodite : 1/16
dumpy male: 1/16
uncordibated and dunpy hermaphrodite : 1/16
uncordinated and dunpy hermaphrodite : 1/16
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