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In the nematode, Caenorhabditis elegans , there are two mutations, dumpy (dmp) a

ID: 32456 • Letter: I

Question

In the nematode, Caenorhabditis elegans, there are two mutations, dumpy (dmp) and uncoordinated (unc). These animals have two sexes, male and hermaphrodite. Hermaphrodites will reproduce by self-fertilzation. A heterozygous hermaphrodite dmp^(+) dmp unc is allowed to self-fertilize and her offspring are examined. The data are shown in Table 1:

Table 1 F2 progeny from heterozygous

                 Dmp^(+) dmp unc^(+) parent

Do these two genes appear to assort independently? Calculate a X^(2) value to answer this question?

Phenotype Number Wild Type 864 Dumpy 339 Uncoordinated 311 Dumpy, uncoordinated 86

Explanation / Answer

hese two genes does not appear to assort independently.

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