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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.

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From the table, we can see that 9 of the offspring are purple round (TTRR or TTRr or TtRr or TtRR); 3 are purple wrinkled (Ttrr or TTrr); 3 are yellow round (ttRR or ttRr) 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). According to the CHI-squared table, we can see our value of 0. 8036 lies between 0. 6 and 1. 0. From this we can say that the probability that this result is significant is between 80% and 90%.

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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.

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Kylie Garcia

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