Amanda N. Wavrin Week 2

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Revision as of 17:56, 31 January 2010 by Amanda N. Wavrin (talk | contribs) (added results section)
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Objective

  • Determining how color is inhertited in these test flowers.
  • We are working with a single gene system.
  • Alleles are versions of genes.

observations

  • When crossing a pure-breeding green (Green-1) flower with a pure-breeding white flower all of the off spring were green. This would indicate that green is dominant.
  • When I self crossed one of the previous off spring flowers, it resulted in 19 green flowers and 7 whte flowers. This shows that self crossed flower was heterzygous. When I repeated this cross a second time, it resulted in 4 white flowers and 15green flowers.
  • When I continued to mutate one of the white flowers(2-9), all of the off spring were white.
  • I mutated a white flower (2-21) again and it resulted in all white off spring.
  • I mutated a white flower (2-2), resulted in all white off spring.
  • I mutated a white flower (2-14)for the fourth time, resulted in all white off spring.
  • When I mutated white flower 2-17 the results were 14 white flowers, one mutant yellow flower and one mutnatred flower.
  • When I crossed the Yellow and Red mutants, it resulted in 6 orange mutants, 10 White, 8 Red, and 4 Yellow. When I repeated this cross, it resulted in 4 Yellow mutants, 4 Red, 7 orange, and 5 White.
  • Crossed Green-2 and Mutated red, resulted in 7 Purple, 9 Orange, 8 Yellow, 4 Blue.
  • When self crossed purple flower, resultd in 9 purple flowers,5 red flowers, 5 blue flowers.
  • Self crossed another purple flower, resulted in 9 purple flowers, 8 blue flowers,8 red.
  • Crossed Blue and Purple, resulted in 10 purple, 14 blue.
  • Crossed purple and Gree2, resulted in 9 Purple, 4 Blue,3 Orange, 4 Green.
  • Crossed orange and white, resulted in 13 Orange, 7 red.
  • Self crossed blue, all blue off spring. Repeated.
  • Crossed two Blue, all blue off spring. Repeated.
  • Self cross green2- result in blue, yellow, and green. Codominance.
  • Crossed Green1 and Red, resulted in 15 black flowers and 7 green flowers.
  • Crossed prebreeding red and green1, resulted in all black. Incomplete dominance.

Answers to Aipotu Genetics Questions

A) Phenotypes and Corresponding Genotypes

  • These are the different alleles: Cg, Cw, Cr, Cb, Cy. Different combinations of the alleles produce different colors:
  • Green1- CgCg
  • White- CwCw
  • Red- CrCr
  • Blue- CbCb
  • Orange- CrCy
  • Yellow- CyCy
  • Purple- CrCb
  • Black- CrCg
  • Green2- CyCb

B)

  • Green1 is dominant to blue
  • Green1 is dominant to white
  • Green1 is dominant to gree2
  • Green1 is dominant to yellow
  • Green1 and red exhibit incomplete dominance
  • White is recessive
  • Green and blue are codominant

C) List of colors produced by allelic combinations

  • CgCg-Green1
  • CgCw-Green1
  • CgCr-Black
  • CgCb-Green1
  • CgCy-Green1
  • CwCw-White
  • CwCr-Red
  • CwCb-Blue
  • CwCy-Yellow
  • CrCr-Red
  • CrCb-Purple
  • CrCy-Orange
  • CbCb-Blue
  • CbCy-Green2
  • CyCy-Yellow

D)The four starting organisms:

  1. Green1- CgCg
  2. Green2- CyCb
  3. Red- CrCw
  4. White- CwCw

E) Purple Flower- CbCr

F) No, you cannot construct a pure-breeding purple flower with the starting set of organisms. You need a mutation to get a pure-breeding purple flower.

G) It is easier to mutate from color to white.

New colors found by mutation:

  • Purple
  • Black
  • Orange
  • Yellow
  • Blue

These colors are also attainable through cross-breeding.

H) I chose a mutant black flower, made it pure-breeding, and crossed it with a pure-breeding white flower.

  • All black offspring
  • Black mutant is dominant to white

Results

I was unable to construct a pure-breeding purple flower starting with the original set of organisms. A mutation would have to occur, resulting in a pure-breeding purple flower.

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