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

(N/A) The sex of a child is determined by the sex chromosomes inherited from the parents.
$(a)$ $A$ woman is homogametic,meaning she produces only one type of ovum containing the $X$ chromosome.
$(b)$ $A$ man is heterogametic,meaning he produces two types of sperms: $50\%$ containing the $X$ chromosome and $50\%$ containing the $Y$ chromosome.
$(c)$ If a sperm carrying the $X$ chromosome fertilizes the ovum,the zygote will be $XX$ (female).
$(d)$ If a sperm carrying the $Y$ chromosome fertilizes the ovum,the zygote will be $XY$ (male).
$(e)$ Therefore,the father is responsible for the sex of the child. If a woman has only daughters,it implies that in every fertilization event,the sperm carrying the $X$ chromosome successfully fertilized the ovum,or the sperm carrying the $Y$ chromosome failed to produce a viable male zygote.