Morgan obtained a white-eyed male fly in a population containing many red-eyed flies that he thought were truebreeding. As mentioned in the experiment, he crossed this fly withseveral red-eyed females, and all the offspring had red eyes. Butactually this is not quite true. Morgan observed 1237 red-eyed fliesand 3 white-eyed males. Provide two or more explanations why heobtained 3 white-eyed males in the F1 generation. Starting material: A true-breeding strain of red-eyed fruit flies plus one white-eyed male fly that was discovered in the culture.Experimental levelConceptual levelxwY x xwxw1. Cross the white-eyed male to atrue-breeding red-eyed female.P generation2. Record the results of the F1 generation. F1 generationThis involves noting the eye color andsex of many offspring.male offspring and X X" femaleoffspring, both with red eyesx XW X"XWY хwү1Х**ҳ*I red-eyed male : 1 white-eyed male :2 red-eyed femalesX"'X"3. Cross F1 offspring with each other toobtain F2 offspring. Also record theF2 generationeye color and sex of the F2 offspring.4. In a separate experiment, perform atestcross between a white-eyed malefrom the F2 generation and ared-eyed female from the F1generation. Record the results.X" Yx X" X"| X"'Y I X" Y: I X"X" : 1 X"X"|red-eyed male : 1 white-eyed male :I red-eyed female : white-eyed female

Thomas Hunt Morgan selected Drosophila melanogaster as experimental material and performed a cross…

Answered: Starting material: A true-breeding…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Morgan obtained a white-eyed male fly in a population containing many red-eyed flies that he thought were truebreeding. As mentioned in the experiment, he crossed this fly with
several red-eyed females, and all the offspring had red eyes. But
actually this is not quite true. Morgan observed 1237 red-eyed flies
and 3 white-eyed males. Provide two or more explanations why he
obtained 3 white-eyed males in the F1 generation.

Starting material: A true-breeding strain of red-eyed fruit flies plus one white-eyed male fly that was discovered in the culture.
Experimental level
Conceptual level
xwY x xwxw
1. Cross the white-eyed male to a
true-breeding red-eyed female.
P generation
2. Record the results of the F1 generation. F1 generation
This involves noting the eye color and
sex of many offspring.
male offspring and X X" female
offspring, both with red eyes
x XW X"
XWY хwү1Х**ҳ*
I red-eyed male : 1 white-eyed male :
2 red-eyed females
X"'X"
3. Cross F1 offspring with each other to
obtain F2 offspring. Also record the
F2 generation
eye color and sex of the F2 offspring.
4. In a separate experiment, perform a
testcross between a white-eyed male
from the F2 generation and a
red-eyed female from the F1
generation. Record the results.
X" Yx X" X"
| X"'Y I X" Y: I X"X" : 1 X"X"|
red-eyed male : 1 white-eyed male :
I red-eyed female : white-eyed female

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