Some lizards in a population had longer leg bones than others. They were able to climb better than the lizards with shorter legs, so they were able to escape from their predators on the ground. Over time, lizards with shorter legs died out so that all the lizards in the population now have longer legs. Which process has caused this change within the lizard population?

In fruit flies, the allele for an ebony coloured body is recessive to the allele for a grey coloured body. In an inve…

Which statement about dominant and recessive alleles is not correct?

The genotype for the height of an organism is written as Tt. What conclusion may be drawn?

Why is the organism that causes malaria called both a parasite and a pathogen?

The list shows some changes that may occur in a lake that is polluted with nitrogen-containing fertiliser. 1 Concentr…

Which substances are present in breast milk but not in bottled milk made from milk powder?