Question

In the California poppy, an allele for yellow flowers (C) is dominant over an allele for...

In the California poppy, an allele for yellow flowers (C) is dominant over an allele for white flowers (c).At an independently assorting locus, an allele for entire petals (F) is dominant over an allele for fringed petals (f). A plant that is homozygous for yellow and entire petals is crossed with a plant that is white and fringed. The F1 progeny were then test crossed and the following progeny were produced: 54 yellow and entire, 58 yellow and fringed, 53 white and entire, and 10 white and fringed.
Use a chi-square test to compare the observed numbers with those expected for the cross. Please feel free to use the chi-squared equation and the chi-squared distribution table (found in the text, in my lectures and notes, and online in many locations) to answer the following questions.

What is the p-value for this cross?

A.

0.01<p<0.05
B.

0.05<p<0.1
C.

p<0.01
D.

0.5<p<0.995
E.

0.1<p<0.5

The answer is not A. I'm thinking it is B, but I'm not sure

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Homework Answers

Answer #1

Parents: yellow, entire petals (CC FF) × white, fringed petals (cc ff) F1 (Cc Ff)

For the cross of a heterozygous F1 individual (Cc Ff) with a homozygous recessive

individual (cc ff) we would expect a phenotypic ratio of 1:1:1:1 for the different phenotypic classes.

Phenotype Observed (O) Expected (E) (O - E)2/ E or ( 2)

Yellow, entire 54 43.75 2.40

Yellow, fringed 58 43.75 4.64

White, entire 53 43.75 1.96

White, fringed 10 43.75 26.0

Total 175 175 35

Degrees of freedom = 4 - 1 = 3. The chi-square value is greater than 12.838 for a probability value less than .005, or 0.5% that random chance produced the observed ratio of California poppies.

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