• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Inheritance Pattern of Maize Cob.

Extracts from this document...

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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Alice Walker section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Alice Walker essays

  1. Gender roles in The Color Purple.

    Harpo also tries to beat Sophie as his father, Albert, instilled the practice of violent command in him when he was just boy. On the contrary, masters could also be lenient with the slave code enforcement. Slaves were sometimes able to acquire property, learn to read and write, and assemble with other slaves (Brinkley 382).

  2. Analysis of "The Colour Purple" -first three letters

    It is as if Walker is drawing a parallel between deity and masculinity. She is drawing attention to how the masculine image of God has been used as a tool of power for patriarchy's ends. Nobody questions Alphonso's actions, and he has the power to give life and take it

  1. Many would argue that men hold the power in "The Colour Purple". Explore the ...

    This is shown when she goes into town and bumps into her baby and her step mother in a store where the clerk was rude and showed no good manners to them. He speaks in an imperative tone, "girl you want that cloth or not?

  2. Examine the author's presentation of men, women and gender roles in 'The Color Purple' ...

    In a similar way, it can be said that the father in "Oranges Are Not the Only Fruit" is also portrayed in a negative way immediately. This is simply explicit, by the way the protagonist, Jeanette, describes her fathers action.

  1. This report is based on comparing six different documents.

    Every other page has the Spelthorne website at the bottom in the boarder and also it has a mouse over saying "Adult education courses see page 28 for full listing". Every page also has a purple line going through the top of it and a full circle going through the large boarder on the left hand side.

  2. What key phenomena must theories of colour perception account for? Describe and evaluate ...

    The two grey lines in the middle of the colour blocks are identical, producing the same reflectance (Kaiser and Boynton, 1996). If one is fixated on, it will appear the opposite colour to its surround (Yellow block's strip would appear bluish).

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work