CIE A2 Selection and evolution

Welcome to your CIE A2 Selection and evolution

Select the correct statement about sympatric speciation.

A prezygotic isolating mechanism.

Which is not an advantage of having shorter stems in wheat plants?

Select the incorrect statement regarding antibiotics.

An example of continuous variation.

In 2011, which animal was declared extinct by the IUCN?

Which of the following gives rise to genetic variation in a population?
a) crossing over and independant assortment in meiosis
b) different environmental conditions
c) random mating and fertilisation
d) mutation

A species of finch living on an isolated island shows variation in beak size. Birds with larger beaks can eat larger seeds. After a period of drought on the island, large seeds were more plentiful than small seeds and the average size of the finches' beaks increased. What explains this increase in size of beak?

The International Union for Conservation of Nature (IUCN) annually publishes a ________ of threatened species.

The type of selection that occurs when conditions favour both extremes of a population.

In Siamese cats, dark hair develops where the skin is at relatively low temperature. This is an example of: