Name the scientist who worked out the rules of inheritance

(a) Name the scientist who worked out the rules of inheritance.
(b) Mention any two strategies that are used by different species for determining Sex of their newborns.

(a) Mendel.
(b) Some rely on environment cues. In some animals the temperature at which fertilized egg is kept determines its sex.
In snails, individuals can change sex, indicating that sex is not genetically determined.