Question: 1. In a monohybrid cross of corn plants, purple seeds (P) are dominant to yellow (Y). Both parent...

Question: 1. In a monohybrid cross of corn plants, purple seeds (P) are
dominant to yellow (Y). Both parent…

1. In a monohybrid cross of corn plants, purple seeds (P) are
dominant to yellow (Y). Both parents in the original cross are
homozygous. One has purple seeds, and one has yellow seeds. What is
the genotype of the purple plant?

2. In a monohybrid cross of corn plants, purple seeds (P) are
dominant to yellow (Y). Both parents in the original cross are
homozygous. One has purple seeds, and one has yellow seeds. What is
the genotype of the yellow plant?

YY
		Y
		YP
		PP

3. In a monohybrid cross of corn plants, purple seeds (P) are
dominant to yellow (Y). Both parents in the original cross are
homozygous. What are the possible gametes for the purple
parent?

Y
		P
		Y or P
		P

4. In a monohybrid cross of corn plants, purple seeds (P) are
dominant to yellow (Y). Both parents in the original cross are
homozygous. One has purple seeds, and one has yellow seeds. What is
the genotype of the yellow plant?

Y or P

5. What is the genotype of the F1
generation?

		1/4 PP, 1/2 PY, 1/4 YY
		all PY
		all PP
		all YY

6. What would be the possible phenotypes of the F1
generation?

	all purple
		all yellow
		mixed red and purple
		green

7. What are the possible gametes for the F1 generation (the
gametes that would produce the F2 generation)?

all Y

all P

all PY

P and Y

8. If the F1 generation self-pollinates (random process), what
are the expected ratios and phenotypes of the F2?

all purple

all yellow

1:1 purple to yellow

3:1 purple to yellow

9. Given the number of observations of F2 individuals, and your
expected ratio (3:1), how many of these kernels would you expect to
be purple?

10. Given the number of observations of F2 individuals, and your
expected ratio (3:1), how many of these kernels would you expect to
be yellow?

11. What was your F2 deviation for purple seeds? (observed
number of purple seeds minus expected number). Report as a
positive, whole number.

12. What was your F2 deviation
for yellow seeds? (observed number of yellow seeds minus expected
number). Report as a positive, whole number.

13. Dihybrid cross. Now to increase complexity of the genetics,
problem, you are going to add another trait. We will still work
with purple (P) and yellow (Y) seeds, but we’re adding seed shape.
Smooth (S) is dominant to wrinkled (s). If you have a parent
generation that is homozygous at both loci, and one parent has
purple smooth seeds, and the other has yellow wrinkled seeds, what
is the genotype of the purple parent?

		PPss
		PPYY
		YYSS
		PPSS

15. Dihybrid cross. Now to increase complexity of the genetics,
problem, you are going to add another trait. We will still work
with purple (P) and yellow (Y) seeds, but we’re adding seed shape.
Smooth (S) is dominant to wrinkled (s). If you have a parent
generation that is homozygous at both loci, and one parent has
purple smooth seeds, and the other has yellow wrinkled seeds, what
is the genotype of the yellow parent?

YYSS

SSss

PPYY

YYss

16. What percentage of the F1 generation would you expect to be
heterozygous at both loci (PYSs)?

100

17. What is the expected phenotypic ration of the F2
generation?

		3:1 purple smooth to yellow wrinkled
		1:1:1:1 (purple smooth: purple wrinkled: yellow smooth: yellow wrinkled)
		2:1:1:1 (purple smooth: purple wrinkled: yellow smooth: yellow wrinkled)
	18.	9:3:3:1 (purple smooth: purple wrinkled: yellow smooth: yellow wrinkled) The chi square value is higher for the class results than for the individual results. Yes No