Question 2
2 pts
Which of the following individuals has the darkest skin color. Dark skin is represented by
the dominant allele.
AaBBCC
AAbbcc
AaBBCC
АаВЫСс

Individual with genotype AaBBCC has the dark skin colour.

Explanation:

The skin colour is a polygenetic trait i.e two or more genes control the particular characteristic in an individual.

The amount of gene in the individual in such cases would determine the skin tone.

It is given that dominant alleles are responsible for darkest colour of the skin in the example. We could see that the genotype AaBBCC has maximum dominant alleles which makes us to deduce that individual with this genotype will have dark skin phenotype.

This quantitative occurrence of alleles in the individual decides its skin colour and variations in it.

The genes are independent of each other but have an additive effect on the phenotype like skin colour.

the scientific method.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.