Insects, octopus, planaria and vertebrates possess eyes. Can we group these animals together on the basis of eyes that they possess ? Justify your answer giving reason.
Give an example of characteristics being used to determine how close two species are in evolutionary terms.
Out of the wing of a bird, wing of an insect and the wing of a bat :
which two are homologous organs?
A black mouse mates with a brown mouse, and all the offsprings are black.
(a) Why are no brown offsprings produced?
(b) If two of the black offsprings mate with each other what kind of offspring would you expect and in what proportions? Give reason for your answer.
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