https://padlet.com/WoonKeat/xgxsrrr6on0w Descent with modification through natural selection -- shared ancestry en-us 2017-05-15 09:19:01 UTC 2022-01-20 00:02:49 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Brightnessdown.png https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172482977 Caribous]]> 2017-05-18 04:07:01 UTC https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172482977 https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172483212 Giraffee 
1. Pre-existing variations selected based on amount of rainfall

2. If medium sized beaks, still can eat the small seeds?

3. ]]> 2017-05-18 04:10:02 UTC https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172483212 https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172483238 Normal Distribution & Continuous Variation.
Beak size phenotype controlled by many genes that have an additive effect on phenotype. The level of expression is affected by environment whether there is high or low amounts of rainfall.]]> 2017-05-18 04:10:24 UTC https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172483238 https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172484506 In colder climate, the size of feathers on the crest enlarges as compared to in warmer regions. The size of the crest would be normally assoicated with mating purposes (assuming the birds in the diagrams are males). In colder climates, Drongos are generally more sluggish and would be less willing to engage in vigorous activity. Thus, increased need for the crest to attract and encourage mates for reproduction. In the gene pool, alleles for different sizes of crest already present. Selection pressure is climate. Alleles for large crests are selected for, pass down to trait to localised offspring. population for large crests...]]> 2017-05-18 04:25:31 UTC https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172484506 https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172484558 Q4(b) There is pre-existing variation in phenotypes. Natural selection selects for phenotypes which are best adapted to a particular geographic region. The birds which are selected for are able to survive to sexual maturity and reproduce.]]> 2017-05-18 04:26:15 UTC https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172484558 https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172484900 -pre-existing variation
-different temperatures experienced by different populations which exerts selection pressure 
-hot weather selects for no feathers as they can regulate body temperature better
-cold weather selects for more feathers so as to trap heat 
-natural selection results in alleles being favoured which is passed onto subsequent generations
-increase in diff allele frequencies ]]> 2017-05-18 04:31:09 UTC https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172484900 https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172485381 Q4(d)(ii)
Structures of fossil records: look for similarities in structures, which indicates descendants of a common ancestor.
DNA sequences: the more similar the sequences, the greater the degree of homology.]]> 2017-05-18 04:38:44 UTC https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172485381 https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172485383 4d(ii)
Comparable DNA sequences can be aligned. If the species are very closely related the sequences should differ at few sites.
The bone structures of vertebrates can be compared. Descendants from common ancestor will share similarities in number and arrangement of binrs]]> 2017-05-18 04:38:45 UTC https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172485383 https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172485577 Use both effectively to classify organisms. Group by shared characteristics and homologous phenotypes. ]]> 2017-05-18 04:41:05 UTC https://padlet.com/WoonKeat/xgxsrrr6on0w/wish/172485577