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BREEDING CORN PLANTS PART 1PowerPoint Presentation

BREEDING CORN PLANTS PART 1

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### BREEDING CORN PLANTS PART 1

### BREEDING CORN PLANTS - PART 1

### BREEDING CORN PLANTS - PART 1

### BREEDING CORN PLANTS - PART 1

### BREEDING CORN PLANTS - PART 1

PLEASE READ THE FIRST TWO PARAGRAPHS IN YOUR WORKSHEET

Purebred Purple

Purebred Yellow

A purebred purple colored corn plant is crossed with a purebred yellow colored corn plant.

These lines represent the corn making baby corn, but not the baby corn that is served in some restaurants

______ Purple

Hybrid

What do we call an offspring of purebred parents?

recessive

dominant

heterozygous/hybrid

Purple

The purple gene must be _________ and the yellow gene must be _________ if all of the resulting offspring are purple. That means that the purple offspring show the _________ form, so they are known as __________________.

What color corn kernels result from the following crosses?

A. Heterozygous Purple X Homozygous Purple=_____________

B. Heterozygous Purple X Homozygous Yellow=____________

C. Heterozygous Purple X Heterozygous Purple=____________

Both

Both

Thanks to the magic of technology, counting is easy

When you count your corn please take your time and get it right so you have good data

You will be using a marker to tally the ones you’ve counted while your partner fills in the table

# Purple

# Yellow

Ratio

Corn Ear A

Thanks to the magic of technology, counting is easy

When you count your corn please take your time and get it right so you have good data

You will be using a marker to tally the ones you’ve counted while your partner fills in the table

# Purple

# Yellow

Ratio

Corn Ear A

To calculate the ratio we divide the biggest number by the smallest number

112/110 = 1.02 so after rounding we get 1

Ratio is about 1 : 1

# Purple

# Yellow

Ratio

112 : 110

Corn Ear A

112

110

or

1 : 1

3:1

Pp

Pp

2. Based on the results Table 1, what is the phenotype ratio of Corn B? _______

Recall from Mendel’s work that he got a 3:1 ratio after breeding his F1 generations with each other.

3. To get a 3:1 ratio, we need parents that are ____X ____

A. Use those genotypes to complete the Punnett square

B-C. What are the genotype and phenotype ratios?

G=____ : ____ : ____ P= __________ : ___________

From Table 1, how many total kernels were in Corn B? ______

6. We need to use math to calculate the predicted results

7. The total number of offspring is 228. If 75% (3/4) is purple, than we should multiply 228 X _____ (75%) = _____

8. Use the same formula to calculate the yellow kernels

1 PP

2 Pp

1 pp

3 Purple

1 Yellow

228

.75

171

PP

Pp

pp

PP

Pp

pp

4

PR

9. Which crop will produce an all yellow crop the soonest?

10. Using Mendel’s Law of Independent Assortment and the possible genotypes in Corn A (____ ____ ____) & possible genotype in B (____ ____ ____).

11. Use the FOIL method to get the ____ different gametes for the genotype PpRr

First =

Outer =

Inner =

Last =

Pr

pR

pr

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