What are the expected genotype and phenotypic ratio

Reference no: EM132539300

Genetics of Corn

Corn is one of the world's most important food crops. It has been subject to selective breeding techniques and hybridization for many years, which have resulted in vigorous, high-yielding varieties. Nearly all corn grown today is hybrid corn. Some varieties of corn are chosen for their sweet flavour while the mixed coloration of the Indian corn varieties makes them popular decorations during the autumn months.

Purpose: To determine the probable genotypes of parents by examining the phenotypes of corn for two different and independently assorted traits.

Materials: Corn Ears (Figures 1, 2, 3 and 4)

Procedure:
1. Look at sample 1 corn ear. The kernels display two different traits whose genes are located different chromosome.

2. Describe the two different traits: colour and shape. Predict which phenotypes are dominant and which are recessive.

Colour: _______________________ Dominant and __________________________ Recessive

Shape:_______________________ Dominant and ___________________________Recessive

3. For each of the corn samples, count at least 100 kernels, and complete the associated table.
• Genotype: Please indicate one possible genotype that would produce the specified phenotype.
• Number:Indicate how many kernels of corn you counted that fit the specified phenotype
• Ratio: Look across all 4 phenotypes and approximate a Mendelian Ratio.

Analysis:

Question 1. What are the expected genotype and phenotypic ratio of the F1 generation resulting from across between the parents PPaa and ppAA?Support your answer with a punnet square

Question 2. What are the expected genotypes and the phenotypic ratio of the F2

Generationfrom Question 1 above. Support your answer with a punnet square

Analysis:

Question 3. Compare and contrast the results from all four corn samples

Question 4. Would the results be any different if you took larger samples of corn (i.e., counted more kernels) or looked at multiple cobs and averaged the results? Explain.

Question 5. Were there any corn cobs that seemed to demonstrate monohybrid characteristics?Were there any corn cobs that seemed to demonstrate dihybrid characteristics? Explain.

Question 6. Is there a discrepancy between Mendel's theoretical ratios and the ratios that were estimated in the corn samples? Explain why this might be.

Conclusion:

What are the possible genotypes of the parents of each sample of corn? Prove it using punnet squares

MLA style.

Attachment:- Genetics of Corn.rar

Reference no: EM132539300

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