https://padlet.com/j_williams10/dbycdswe8gdk en-us 2020-02-26 14:45:48 UTC 2024-06-02 12:07:27 UTC hello@padlet.com https://padlet.com/j_williams10/dbycdswe8gdk/wish/450769960 Sexual selection is a mode of natural selection in which members of one biological sex choose mates of the other sex to mate with (intersexual selection), and compete with members of the same sex for access to members of the opposite sex (intrasexual selection).]]> 2020-02-26 14:51:31 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450769960 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450770823 In population genetics, directional selection, or positive selection is a mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype.]]> 2020-02-26 14:52:29 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450770823 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450775170 2020-02-26 14:57:23 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450775170 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450775263 2020-02-26 14:57:31 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450775263 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450776353 2020-02-26 14:58:49 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450776353 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450777229 The industral revolution caused the tree's to become covered in soot, this change forced the peppered moths to adapt. Black winged moths were more camouflaged and died less allowing them to pass their black winged trait on.]]> 2020-02-26 14:59:52 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450777229 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450778319 If directional selection acts in different directions in different populations or species, because of variation in environmental circumstances, then it is described as divergent. This results in populations becoming different, and it can contribute to speciation.]]> 2020-02-26 15:01:13 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450778319 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450778369 Sexual selection is a form of natural selection where one sex prefers a specific characteristic in an individual of the other sex. Peafowls exhibit sexual selection in that peahens look for peacocks with more "eyes" on their tail feathers. This results in the peacocks with more eyes reproducing more, leading to peacocks with more eyes becoming more common in subsequent generations.]]> 2020-02-26 15:01:17 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450778369 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450779395 An example of directional selection is fossil records that show that the size of the black bears in Europe decreased during interglacial periods of the ice ages, but increased during each glacial period. Another example is the beak size in a population of finches. Throughout the wet years, small seeds were more common and there was such a large supply of the small seeds that the finches rarely ate large seeds. During the dry years, none of the seeds were in great abundance, but the birds usually ate more large seeds. The change in diet of the finches affected the depth of the birds’ beaks in the future generations. Their beaks range from large and tough to small and smooth.]]> 2020-02-26 15:02:44 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450779395 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450780136 Sexual selection can also come about because a trait—the antlers of a stag, for example—increases prowess in competition with members of the same sex. Stags, rams, and bulls use antlers or horns in contests of strength; a winning male usually secures more female mates.]]> 2020-02-26 15:03:38 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450780136 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450781843 Sexual selection can also come about because a trait—the antlers of a stag, for example—increases prowess in competition with members of the same sex. Stags, rams, and bulls use antlers or horns in contests of strength; a winning male usually secures more female mates.]]> 2020-02-26 15:05:28 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450781843 https://padlet.com/j_williams10/dbycdswe8gdk/wish/450784158 2020-02-26 15:08:11 UTC https://padlet.com/j_williams10/dbycdswe8gdk/wish/450784158