I am lost on the goodness of fit table and the other questions on the page. Tabl

Question

I am lost on the goodness of fit table and the other questions on the page.

Table 5: Goodness of fit table for T. H. Morgan's fruit fly experiment. Exp Obs Phenotypes y Drosophila melanogaster, gray body color is dominant to black, and long wings o short (called vestigial). Thomas Hunt Morgan, who studied these traits, ed dihybrids with black-bodied, vestigial- 4. In the fruit fl are dominant t performed test crosses of gray-bodied, long-wing winged homozygotes (BbVu x bb), from which he obtained 2300 offspring (o) If thee traits obey Mendel's second principle, how many of exch phenotype do we ex- pect to see among offspring (b) Morgan actually obtained the following results: 965 offspring were gray body /long wings; 944 were black body/vestigial wings, 206 were gray/vestigial and 185 were black/long. With this information fill in the goodness of fit table (table 5) and cal- culate x2 (c) The critical value for this test is still 7.815. Does Morgan's study support or contradict the claim that body color and wing length obey Mendel's Principle of Independent Assortment? Defend your answer. 12 Nagy ev: Spring 2018

Explanation / Answer

Answer:

4a).

BbVv (gray body & long wings) x bbvv (black body & vestigial wings)---P1

bv

BV

BbVv (gray body & long wings) 25% * 2300 =575

Bv

Bbvv (gray body & vestigial wings) 25% * 2300 =575

bV

bbVv (black body & long wings) 25% * 2300 =575

bv

bbvv (black body & vestigial wings) 25% * 2300 =575

Phenotype

Observed(O)

Expected (E)

O-E

(O-E)2

(O-E)2/E

Gray & long

965

575.00

390.00

152100.00

264.52

Gray & vestigial

206

575.00

-369.00

136161.00

236.80

black & long

185

575.00

-390.00

152100.00

264.52

black & vestigial

944

575.00

369.00

136161.00

236.80

Total

2300

2300.00

1002.65

X^2 = 1002.65

4c).

A chi-square of 1002.65 is greater than the critical value (7.815), so we can reject the null hypothesis. Genes are linked.

bv

BV

BbVv (gray body & long wings) 25% * 2300 =575

Bv

Bbvv (gray body & vestigial wings) 25% * 2300 =575

bV

bbVv (black body & long wings) 25% * 2300 =575

bv

bbvv (black body & vestigial wings) 25% * 2300 =575

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