Question

Experiment 1: Punnett Square Crosses

1. Set up and complete Punnett squares for these crosses (remember Y = yellow, y = blue):
   1. YY and Yy
   2. YY and yy
2. Answer these questions:
   1. What are the resulting phenotypes? All yellow
   2. Are there any blue kernels? No
   3. How can you tell whether or not there are blue kernels? This is because Yellow allele dominates and also it still shows up over the blue allele in the heterozygous chromosomes
3. Set up and complete a Punnett square for a cross of two of the F₁ from Step 1 (above).
4. Answer these questions:
   1. What are the genotypes of the F₂ generation?
   2. What are their phenotypes?
   3. Are there more or fewer blue kernels than in the F₁ generation?
5. Identify the four possible gametes produced by the following individuals (S = smooth, s = wrinkled):
   1. YY Ss:
   2. Yy Ss:
   3. Create a Punnett square using these gametes as P₁ and determine the genotypes of the F₁.

What are the phenotypes? What is the ratio of those phenotypes?

PLEASE TYPE ANSWERS AS I HAVE DIFFICULTY READING HANDWRITTEN ANSWERS

Answer 1

Set up and complete Punnett squares for these crosses (remember Y = yellow, y = blue):

1. YY and Yy
2. YY and yy

YY and Yy

	Y	Y
Y	YY	YY
y	Yy	Yy

• What are the resulting phenotypes?

Answer- Yes, All yellow.

• There any blue kernels?

Answer- No.

• How can you tell whether or not there are blue kernels?

Answer- Y is dominant over y, So for a kernel to be blue two copies of y are needed.

YY and yy

	Y	Y
y	Yy	Yy
y	Yy	Yy

• What are the resulting phenotypes?

Answer- Yes, All yellow.

• There any blue kernels?

Answer- No.

• How can you tell whether or not there are blue kernels?

Answer- Y is dominant over y, So for a kernel to be blue two copies of y are needed.

YY and Yy, F2 Generation for this cross.

F1 generation - YY and Yy

	Y	Y
Y	YY	YY
y	Yy	Yy

• What are the genotypes of the F₂ generation?

Answer- YY and Yy

• What are their phenotypes

All the kernels are Yellow.

• Are there more or fewer blue kernels than in the F₁ generation?

Answer- No, in this case, no such case is observed. There is no change in number of blue kernels.

YY and yy, F2 generation

F1 Generation -Yy and Yy

	Y	y
Y	YY	Yy
y	Yy	yy

• What are the genotypes of the F₂ generation?

Answer- YY,Yy and yy

• What are their phenotypes

Answer- Yellow and blue kernels

• Are there more or fewer blue kernels than in the F₁ generation?

Answer-More, blue kernels are observed when compared to F1 generation.

Identify the four possible gametes produced by the following individuals (S = smooth, s = wrinkled):

1. YY Ss:
2. Yy Ss:

• YY Ss:

possible gametes- YS, Ys, YS and Ys

	YS	Ys	YS	Ys
YS	YYSS	YYSs	YYSS	YYSs
Ys	YYSs	YYss	YYSs	YYss
YS	YYSS	YYSs	YYSS	YYSs
Ys	YYSs	YYss	YYSs	YYss

Genotype of F1 generation- YYSS,YYSs,and YYss

• Yy Ss:

Possible gametes- YS,Ys,yS and ys

	YS	Ys	yS	ys
YS	YYSS	YYSs	YySS	YySs
Ys	YYSs	YYss	YySs	Yyss
yS	YySS	YySs	yySS	yySs
ys	YySs	Yyss	yySs	yyss

Genotype of F1 generation- YYSS, YYSs,YySS,YySs,YYss,Yyss,YySS,YySs,yySS,yySs and yyss..

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