In the speckled YakkityYak bird, speckles and the song 'don'ttalkback' are dominant traits while no speckles and the song 'yakkityyakkity' are recessive traits. You cross a bird that is heterozygous for speckling and recessive for song with a bird that is heterozygous for all traits. What proportion of their offspring will sing 'yakkityyakkity'?

MCQs on how organisms evolve over time, with particular emphasis on natural selection, evolution, speciation, phylogeny and taxonomy, and aspects of genetics and inheritance. As well as the study of population ecology and ecosystems.