Questions 9-15 are related. The drosophila alleles for purple eyes (instead of r

Question

Questions 9-15 are related. The drosophila alleles for purple eyes (instead of red) and dumpy wings (instead of normal) are both recessive. Gene “E” designates eye color (E: dominant, e: recessive), and gene “D” designates wing shape (D: dominant, d: recessive). You cross a pure breeding purple eyed, normal winged fly to a true breeding red eyed, dumpy winged fly.

13. Calculate the chi squared value if the genes are on different chromosomes. Enter your answer as a number with the following format: x.xx (answer should be given to two decimal places).

14. Calculate the chi squared value if your friend is correct. Enter your answer as a number with the following format: x.xx (answer should be given to two decimal places).

Explanation / Answer

Purple eye=ee, red eye=EE, Dumpy wings=dd, Normal= DD

eeDD * EEdd

F1=EeDd

If the genes are in different chromosomes

F2=

EEDD=red normal

EEDd=Red normal

EeDd=Red normal

EeDd=Red normal

EEDd=Red normal

EEdd=Red Dumpy

EedD=Red normal

Eedd=Red Dumpy

eEDD=Red normal

eEDd=Red normal

eeDD=purple Normal

eeDd=purple normal

eEDd=Red normal

eEdd=Red Dumpy

eeEd=Purple Normal

eedd=Purple dumpy

Red normal=9. RedDumpy=3, Purple Normal=3, Purple Dumpy=1

You have to know the numbers of observed phenotypes in your experiment. Chi square= 1.8

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