10) What is/are the parental phenotypic type(s) you predict in the F2 (progeny of the F1 cross)?
11) What is/are the recombinant type(s) you predict in the F2 (progeny of the F1 cross)?
12) Now that you can distinguish parental vs recombinant types, you can calculate the recombination between w+ and m+:
write the fraction and calculate the recombination frequency:
number of recombinant types
_______________________ = ___________ =
Total number of progeny
Now express the recombination frequency in centimorgans:
13) what would be the expected numbers for each phenotypic class in the F2, if the genes were UNLINKED? HINT: think of what would happen if w+ were on an autosome, with the same F1 parental cross.
14) Let us do a chi square analysis to see if the numbers obtained in figure 15.3 hold up.
Our hypothesis will be: THERE IS NO GENETIC LINKAGE between w+ and m+
- how many degrees of freedom? Why?
- write down the chi square equation: for each category, add (observed-expected)2
___________ + ___________ + ___________ + __________
-the chi square result is 169.79
-look at the provided Table:
do you reject or accept the null hypothesis?
Do you think the observed results deviate from the expected numbers for the null hypothesis?
-do you think the observed numbers support linkage between w+ and m+?
Homework Answers
Add Answer to:
10) What is/are the parental phenotypic type(s) you predict in
the F2 (progeny of the F1...
The results for the F2 progeny are shown for a F1 cross using the two X-linked...
The results for the F2 progeny are shown for a F1 cross using
the two X-linked markers:
w+ and m+.
As shown in the figure, the F1 cross is between the following
two parents:
- a phenotypically wild-type (red eye, full wing), heterozygous
female: w+m+/wm
- a double mutant male (white eye, miniature wing):
wm/Y
Answer the following questions:
1) In the F1 cross, can you infer the genotype for the phenotype
in the female? Why or why not?
2)...
6) What is/are the parental gamete(s) for the male? 7) What is/are the parental gamete(s) for...
6) What is/are the parental gamete(s) for the
male?
7) What is/are the parental gamete(s) for the female?
8) What is/are the recombinant gamete(s) for the male?
9) What is/are the recombinant gamete(s) for the female?
wmlwm White eye Miniature wing w m/YO Red eye Full wing W W m wmlwm Red eye Full wing wm/Yd White eye Miniature wing Phenotypes and genotypes of the F Females Males Number observed w m w*m/wm Red eye Full wing w m /Y...
wmlwm White eye Miniature wing w m/YO Red eye Full wing W W m wmlwm Red...
wmlwm White eye Miniature wing w m/YO Red eye Full wing W W m wmlwm Red eye Full wing wm/Yd White eye Miniature wing Phenotypes and genotypes of the F Females Males Number observed w m w*m/wm Red eye Full wing w m /Y Red eye Full wing W m wm GP 750 W m wmlwm White eye Miniature wing wm/Y White eye Miniature wing W m w mlwm Red eye Miniature wing w m/Y Red eye Miniature wing W...
What are the expected phenotypic ratios of the F1 and F2 progeny assuming that your parental...
What are the expected phenotypic ratios of the F1 and F2 progeny assuming that your parental mutant stocks (P1 and P2) are: P1 carries recessive alleles for the trait of interest and P2 carries dominant alleles for that trait?
Genetics questions, i need help! 1) For the Drosophila red/white cross, you crossed red females and...
Genetics questions, i need help!
1) For the Drosophila red/white cross, you crossed red females and white males (w'w, wy). a) Draw the Punnett Square for this cross (F1). What is the ratio of red females:red males? b) Suppose in the F1 generation, you observed 70 red females and 30 red males. Do a Chi- Square Test to test the hypothesis of the ratio you found in part (a) above. Do you accept or reject the hypothesis? c) Draw the...
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15. You are studying com plants. You were able to determine that the gene for kernel color (C-colored and no color) and kernel waxiness (W = waxy and not waxy) are on the same chromosome and are 30 CM apart. You are ultimately interested in determining the potential phenotypic ratio if crossing over occurs. You start by crossing a male who is homozygous dominant for both genes with a female who is homozygous recessive for both genes. The F1 heterozygotes...
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LABORATORY 6. MENDELIAN GENETICS: GENERAL REMARKS AND Drosophila 1. Are the genes for the body color,...
LABORATORY 6. MENDELIAN GENETICS: GENERAL REMARKS AND Drosophila 1. Are the genes for the body color, eye color, and wing shape recessive or dominant? Explain your answer. Yellow: _______________ White: _________________ Miniature: ____________ Sepia: _________________ Explanation: _________________________________________ _________________________________________ _________________________________________ _________________________________________ _________________________________________ 2. Where are these genes located? On an autosome(s) or sex chromosome? Explain your answer Yellow: _______________ White: _________________ Miniature: ____________ Sepia: _________________ Explanation: _________________________________________ _________________________________________ 2. Set up a X2 to test if the yellow (y) (body color)...
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The results for the F2 progeny are shown for a F1 cross using
the two X-linked markers:
w+ and m+.
As shown in the figure, the F1 cross is between the following
two parents:
- a phenotypically wild-type (red eye, full wing), heterozygous
female: w+m+/wm
- a double mutant male (white eye, miniature wing):
wm/Y
Answer the following questions:
1) In the F1 cross, can you infer the genotype for the phenotype
in the female? Why or why not?
2)...
6) What is/are the parental gamete(s) for the
male?
7) What is/are the parental gamete(s) for the female?
8) What is/are the recombinant gamete(s) for the male?
9) What is/are the recombinant gamete(s) for the female?
wmlwm White eye Miniature wing w m/YO Red eye Full wing W W m wmlwm Red eye Full wing wm/Yd White eye Miniature wing Phenotypes and genotypes of the F Females Males Number observed w m w*m/wm Red eye Full wing w m /Y...
wmlwm White eye Miniature wing w m/YO Red eye Full wing W W m wmlwm Red eye Full wing wm/Yd White eye Miniature wing Phenotypes and genotypes of the F Females Males Number observed w m w*m/wm Red eye Full wing w m /Y Red eye Full wing W m wm GP 750 W m wmlwm White eye Miniature wing wm/Y White eye Miniature wing W m w mlwm Red eye Miniature wing w m/Y Red eye Miniature wing W...
Genetics questions, i need help!
1) For the Drosophila red/white cross, you crossed red females and white males (w'w, wy). a) Draw the Punnett Square for this cross (F1). What is the ratio of red females:red males? b) Suppose in the F1 generation, you observed 70 red females and 30 red males. Do a Chi- Square Test to test the hypothesis of the ratio you found in part (a) above. Do you accept or reject the hypothesis? c) Draw the...
15. You are studying com plants. You were able to determine that the gene for kernel color (C-colored and no color) and kernel waxiness (W = waxy and not waxy) are on the same chromosome and are 30 CM apart. You are ultimately interested in determining the potential phenotypic ratio if crossing over occurs. You start by crossing a male who is homozygous dominant for both genes with a female who is homozygous recessive for both genes. The F1 heterozygotes...
Several genes are involved in determining kernel color and the effects of their alleles are outlined in the table below. Relationship Trait Endosperm Color Y>y Aleurone Color R> C'> > Aleurone Color Inhibitor Genotype Phenotypic Effect Yellow Endosperm White endosperm Purple Aleurone Colorless aleurone No aleurone color in the presence of color alleles like R CC or Cc Aleurone Color in the presence of color alleles like R Colorless aleurone layer in the presence of color genes like R No...
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