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Inheritance Pattern of Maize Cob.

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Introduction

Biology Practical Report ------Inheritance Pattern of Maize Cob Introduction In this experiment, 2 types of maize cobs are provided, which show 2 clear inherited characteristics, i.e. grain colour (purple or yellow) and grain shape (smooth or wrinkled). Each grain is a fruit produced from a separate pollination. This means that each cob carries many individual offspring. The aim of the experiment is to find out the pattern of inheritance of the two maize cobs by counting and scoring the offspring on them. Result Short maize cob Long maize cob Purple round 315 168 Purple wrinkled 104 174 Yellow round 110 173 Yellow wrinkled 40 178 Hypothesis In the short maize cob, the ratio of the phenotypes is approximately 9 (purple round): 3 (purple wrinkled): 3 (yellow round): 1 (yellow wrinkled), which is a classic result in dihybrid cross. ...read more.

Middle

and 1 is yellow wrinkled (ttrr). In the long maize cob, the ratio of the phenotypes is approximately 1 (purple round): 1 (purple wrinkled): 1 (yellow round): 1 (yellow wrinkled), which is also a classic dihybrid ratio (cross test). Purple (T) is dominant to yellow (t) and round (R) is dominant to wrinkled (r). Parents: Phenotypes: purple round yellow wrinkled Genotypes: TtRr ttrr Gametes: TR Tr tR tr all tr Offspring genotypes: TtRr Ttrr ttRr ttrr Phenotypes: purple round purple wrinkled yellow round yellow wrinkled We can see that each of the 4 different phenotype counts for a quarter of the total number of offspring. Calculation (CHI-squared test): Short maize cob Category O E O-E (O-E)2 (O-E)2/E Purple round 315 320.625 -5.0625 25.629 0.08 Yellow round ...read more.

Conclusion

From this we can say that the probability that this result is significant is between 80% and 90%. Put another way, it tells us that the probability that the result is due to chance is between 10% and 20%. Therefore we accept the hypothesis. According to the CHI-squared table, 0.29256 lies between 0.4 and 0.6. From this we can say that the probability that the result is significant is higher than 95% so we accept the hypothesis. The actual result is not exactly the same as the expected result is because: mutation might have occurred; personal inaccuracy in counting; some offspring might have rotted so could not be counted. ...read more.

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