Exchange of genetic material takes place in

Explain analogous organs and homologous organs. Identify the analogous and homologous organs amongst the following:
Wings of an insect,wings of a bat,forelimbs of frog,forelimbs of a human.

If the fossil of an organism is found in the deeper layers of the Earth,then we can predict that:

$(a)$ Why do we say that homozygous plants produce pure progeny?
$(b)$ Define heterozygous.
$(c)$ Explain how the process of speciation takes place.

The human species $(Homo\,sapiens)$ have genetic roots in $......$

$A$ woman has only daughters. Analyse the situation genetically and provide a suitable explanation.