A germ-line mutation in one of the genes implicated in the cancer occurred in an ancestor.
Answer:
it does not specify which is female and which is male so i am going to go with a.
Explanation:
The correct answer is: d) begins later in life
Eggs or female reproductive cells are formed well before birth in a huge number (primordial oocytes). But, the number of oocyte decreases after birth constantly (there are 2 million oocytes at birth and 40,000 of them in puberty). At menopause, no egg cells are left.
On the other hand, the first sperms are formed only from puberty, but the production of those cells never stops.
Answer:
b is the correct answer of your question
