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Darwin

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Unit 3 Designer Animals Artificial and natural selection - Darwin s pigeons: Unit 3 What type of animal are they? Similarities Differences Artificial and natural ... – PowerPoint PPT presentation

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Title: Darwin


1
Unit 3
Designer Animals
Artificial and natural selection - Darwins
pigeons Unit 3
2
What type of animal are they?
  • Similarities
  • Differences

Artificial and natural selection - Darwins
pigeons Unit 3
3
Pigeons!
Artificial and natural selection - Darwins
pigeons Unit 3
4
Pigeon feather colour
Darwins ways of working Unit 1
Artificial and natural selection - Darwins
pigeons Unit 3
5
Pigeon beaks
Darwins ways of working Unit 1
Artificial and natural selection - Darwins
pigeons Unit 3
6
Pigeon crops
Pigeons crop
Darwins ways of working Unit 1
Artificial and natural selection - Darwins
pigeons Unit 3
7
Charles Darwin
1809 -1882
Artificial and natural selection - Darwins
pigeons Unit 3
8
Charles Darwin the pigeon breeder
Artificial and natural selection - Darwins
pigeons Unit 3
9
I do not believe that any ornithologist would
place the English carrier, the short-faced
tumbler, the runt, the barb, pouter, and fantail
in the same genus
Darwin knew they were all the same species but
they look so different that they could be
mistaken for totally unrelated birds.
Artificial and natural selection - Darwins
pigeons Unit 3
10
Wild pigeon (rock dove) to fantail
Artificial and natural selection - Darwins
pigeons Unit 3
11
Breeding cycles
Mr Jones breeds pigeons. One day a pair are
mated
And lay eggs.
Mr Jones notices that one baby pigeon has extra
tail feathers.
He would like more pigeons with extra tail
feathers so he decides to breed from this unusual
pigeon. He does this many times, breeding more
and more birds with extra tail feathers, always
choosing those with the most feathers to breed
again.
He gives some of these birds to other breeders
who breed them in the same way. After a very long
time the magnificent fantail pigeon is produced.
12
Table 1
Offspring - Number of tail feathers Offspring - Number of tail feathers Offspring - Number of tail feathers A B
Mother Father 12 13 14 Total offspring Total offspring with more than 12 tail feathers
8 2 3 13 5
A E 9 2 0
A F 10 0 0
B D 12 0 0
B E 13 0 0
B F 9 0 0
D 11 1 2
C E 14 2 1
C F 12 0 0
13
Table 2
Pigeon Number of offspring with more than 12 tail feathers
A 7
B
C
D
E
F
14
Although man does not cause variability and
cannot even prevent it, he can select, preserve,
and accumulate the variations given to him by the
hand of nature in any way which he chooses and
thus he can certainly produce a great result.
Charles Darwin
Referring to your learning today re-write this
quote in your own words.
Artificial and natural selection - Darwins
pigeons Unit 3
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