In birds found on the Galapagos Islands, measurements show...

In birds found on the Galapagos Islands, measurements show that they have a wide range of beak sizes from 8.5mm to 11.6mm with the average being about 10.2mm. This creates a "Continuous Variation" (normal curve) for the size of beaks among the birds. This observation is most likely the result of the birds having _?_ for this trait. A) a variable iteration B) polygenic inheritance C beak pilates D) multiple mutations

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Transcript

0:00 Hello everyone.

00:01 So in this question we are given a histogram which shows the distribution of peak depth among the medium ground finches on the gallupagos island.

00:25 So here the beak depth varies continuously within the population.

00:30 Here the beak varies continuously within the population.

00:31 Here the beak varies continuously.

00:40 Continuously within this population.

00:45 So we are here asked what might the what might be the reason for the distribution of beak depth and we are here given some choices.

01:05 So we will see all the choices one by one.

01:08 So first one it is said that beak beak depth is a polygenic trade.

01:20 So polygenic trade means we know that which means it is controlled by multiple genes.

01:32 So beak depth is a trade which is of polygenic means it is controlled by multiple genes.

01:43 So this is a correct statement.

01:45 Now we will see the second one that is option b the allele for larger b is dominant for smaller beaks.

01:57 So we already discussed that beak depth is a polygenic rate which means it is controlled by multiple gene.

02:14 Therefore here this is not controlled by a single gene with a dominant and recessive allel.

02:21 So we can see that this statement is incorrect...

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