• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  • Level: GCSE
  • Subject: Maths
  • Word count: 1542

Practical Report: Drosophila BreedingAim In this practical experiment I will cross wild fruit flies with vestigal fruit flies, to investigate which one is dominant or recessive and their characteristics

Extracts from this document...

Introduction

Hani Ali                           Page  of

BTEC ND1

Practical Report: Drosophila Breeding

Aim

In this practical experiment I will cross wild fruit flies with vestigal fruit flies, to investigate which one is dominant or recessive and their characteristics

Introduction

Drosophila melanogaster (fruit fly) is a common, generally innocuous insect that feeds on the fungi growing on fruit.

They are productive breeders, a single mating and they produce a hundreds of offspring and new generation can be bred every two weeks.

These characteristics make the fruit fly convenient organism for genetic studies and the fact that they have only four pairs of chromosomes, which are easily distinguishable with a light microscope. They have 3 pairs of autosome and one pair of sex chromosomes.

Female drosophila has a homologous pair of X chromosomes, and males have one X chromosome and one Y chromosome.

An embryologist named Thomas hunt Morgan, was the first to associate a specific gene with a specific chromosome, for his work he selected species of drosophila (fruit fly). Morgan spent a year breeding the flies and looking for variant individuals. Morgan discovered a single male fly with white eyes instead of usual red eye.

...read more.

Middle

XYBb

Male wild

XYBb

Male wild

Xb

XXBb

Female wild

XXBb

Female wild

XYBb

Female wild

XYBb

Male wild

Xb

XXBb

Female wild

XXBb

Female wild

XYBb

Male wild

XYBb

Male wild

Xb

XXBb

Female wild

XXBb

Female wild

XYBb

Male wild

XYBb

Male wild

                 

 Phenotype       = 100% wild     8 female : 8 male                

Observed result (cross 2)

Cross 2      wild female × vestigial male

F1 100% wild    18 male: 18 female

Expected result

XX = female

XY = male

BB = wild

Bb = wild

bb = vestigial

Cross 2

Parent     wild female × vestigial male

Genotype    XXBB           XYbb

Gametes   XB XB XB XB   Xb Xb Yb Yb

F1 generation

                                                              Male gametes

Xb

Xb

Yb

Yb

XB

XXBb

Female wild

XXBb

Female wild

XYBb

Male wild

XYBb

Male wild

XB

XXBb

Female wild

XXBb

Female wild

XYBb

Male wild

XYBb

Male wild

XB

XXBb

Female wild

XXBb

Female wild

XYBB

Male wild

XYBb

Female wild

XB

XXBb

Female wild

XXBb

Female wild

XYBb

Male wild

XYBb

Male wild

Phenotype = 100% wild          8 male: 8 female

Observed result (cross 3)

Cross 3F1 self cross from cross 1

             Wild male × vestigial female

F 2     18 wild   9 male : 9 female

          6 vestigial  3 male : 3 female

Observed ratio = 3:1

Expected results

XX = female

XY = male

...read more.

Conclusion

Sources of error

  • There could be less pairing number, because Flies could be killed by overdose of flynap
  • Not enough yeast used ( the flies grown eat only yeast given, but there was not enough yeast they may die.
  • There could be human error by using the equipments and flies may not be identified properly (males from females)
  • May be not all females are virgin and if so it wouldn’t be a pure-breeding

...read more.

This student written piece of work is one of many that can be found in our GCSE Height and Weight of Pupils and other Mayfield High School investigations 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 GCSE Height and Weight of Pupils and other Mayfield High School investigations essays

  1. The purpose of this research paper is to present our findings on how the ...

    Also the fact that males were always thought to be intelligent and not to need too much encouragement or help in school also helps to impair their performance. So those males who are not that highly intelligent or may have trouble with certain areas with some subjects who need help

  2. Is there a difference between male and female conversational styles in today's society?

    Before I began all three conversations I asked all the participants if they were comfortable about discussing religious and cultural issues; they did not have a problem. I was hoping to carry out other forms of data such as interviews however I decided not to because I felt this would cause the interviewer to be naturally dominant.

  1. Who is the more dangerous of the species!

    Over the years women have fought many battles. The first one that comes to mind is going through labour. Enduring 9 months of swollen ankles, back pain and no proper bladder control has, in my opinion meant that women have a higher pain threshold. And just try thinking about squeezing something the size of a watermelon through something the size of a lemon...cringe!!!

  2. Obtain information to make a report on family size and the structure of families ...

    Probability of a male birth = 24/49 = 0.4898 Therefore the probability of a female birth is 1-0.4898 = 0.5102 P(X=0) = 1 (0.4898)0 (0.5102)1 = 0.5102 0 P(X=1) = 1 (0.4898)1 (0.5102)0 = 0.4898 1 Therefore the expected frequencies are: 0.5102 x 49 =25 And 0.4898 x 49 =

  1. The aim of this report is to look at the factors and considerations unique ...

    the curving columns that bore the weight of the tower would exert their thrust at right angles to the mast. In each excavator twenty foot deep quick setting cement was poured. Over the cement, blocks of limestone were laid and in turn, these were capped with two layers of ultra hard cut stone (as used for the Arc de Triomphe).

  2. Selective Breeding.

    Mildew also is present in many varieties but will only warrant a treatment if infection levels are high as it can be difficult to control once established. Eyespot is still a disease which some consider somewhat hyped. CPBT believe it poses a great threat to both yield and quality, even in some first wheat situations.

  1. The tragic story of Kitty Genovese, the young New Yorker, who was murdered in ...

    Dependent Variable Helpfulness of the bystanders/ subjects. Sample Opportunistic sample. Selecting those around at the available time in Dunstable town centre during a weekday afternoon in June 2002. (The sample would tend consist of middle aged persons to elderly persons, parents and non employed people since younger persons would either by at school, collage, university or work).

  2. Investigation into the shapes of limpets on sheltered and exposed rocky shores.

    As can be seen from the pictures above, limpets have a hydrodynamic shape so that resistance to water flow is reduced. This ensures that it doesn't overturn as it is less of an 'obstacle'. Limpets feed mainly on microalgae, using a shovel-shaped radula.

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