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

    and slugs.' Winterson portrays the mother as strong-minded, whereas the father is passive and seems to conform to the rules of the house, (set by the mother), making the male gender weak. Similarly, 'Sofia,' in 'The Color Purple' is also presented as a strong-minded character and fiercely independent woman who befriends Celie and marries Harpo, Celie's stepson.

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

    Each cone receptor is either more sensitive to short (S-), (blues) medium (M), (greens) or long (L-) (reds) wavelengths (Eysenk and Keane, 2000). It is suggested, that a particular stimulus's colour is encoded by the ratio of activity in the three receptors (Setrular and Blaker, 1994).

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

    I duck into my room and come out wearing horsehair, feathers, and a pair of our new mammy high heel shoes. He beat me for dressing trampy but he do it to me anyway". Celie here shows her willingness to protect her little sister from the pain and suffering she

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

    At the novel's beginning, the reader is presented with a girl who is writing to God because she feels that she has nobody else to turn to, indeed, she cannot even pray for fear of somebody hearing her. At first, Celie's letters focus only on what she does, hears, sees, and feels.

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

    This prospectus has to be one of the smallest I have seen. 3.1.1.1 Layout The layout of nearly every page in this prospectus is the same it has a few pictures at the top of the page of at the bottom some pictures and text wrapped around them every page has a heading at the top (e.g.

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