If 50% of males in a population dies then the birth rate will decrease to 50%.
For example in a population there are 100 males and birth rate is also 100 per year.
Then after disease only 50 males will remain to reproduce and 50 babies will birth in a year. Hence birth rate also decreased by 50%.
If 50% of females in a population dies then the birth rate will decrease to 50%.
For example in a population there are 100 females and birth rate is also 100 per year.
Then after disease only 50 females will remain to reproduce and they will give birth to 50 babies in a year.
Hence birth rate also decreased by 50%.
Yes, the death of both male and female affected the birth rate of the roaches.
Both male and female death affected the birth rate of roaches because male and female are required for the increasing and maintaining birth rate. Male mate with female produces offspring so male as well as female are necessary for the birth of baby roaches.
If male population becomes half or 50% so due to less mating less female produce less baby roaches which results in decrease of birth rate while on the other hand, if the female population reduced to 50 % then less females are available for producing baby roaches which also affect the birth rate so we can conclude that the death of both male and female affect the birth rate of the roaches.
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