1. Two different types of sex cells unite to form a zygote.
2. The characteristics of the offspring are like those of the parent.
3. Internal fertilization is necessary.
4. The new individual may have been a part of the body of a single parent.
5. The union of a sperm cell and an egg cell results in a zygote.
. Variation is introduced in the members of the species.
· New individuals from a single parent are produced very fast.
The offspring is a combination of the traits of both parents.
Sex cells are involved in the production of offspring.
5. Only one parent is involved.​