The lowest part of the ear called earlobe, is closely attached to the side of the head in some of us (Figure 'X'), and not in others, called free…

The lowest part of the ear called earlobe, is closely attached to the side of the head in some of us (Figure 'X'), and not in others, called free earlobe (Figure 'Y'). Attached and free earlobes are two variants found in human populations. The gene for free earlobe is dominant over attached earlobes.

Figure 'X' Figure 'Y'

A man with attached earlobes marries a woman having free earlobes. $\displaystyle 50$% of their children have free earlobes and $\displaystyle 50$% have attached earlobes. Explain the inheritance of this trait and write the trait combinations of the progeny.

Write the gene combinations of the father and the mother in the above case.