Science Reproduction Sem 2 Flashcards
What is Reproduction?
Is the process by which parents produce new individuals. These new individuals are called offspring.
Sexual reproduction advantages
- Can adapt easier to environmental changes
- Increases genetic variation within a species
- Allows for diversity evolution of a species
Sexual Reproduction disadvantages
- Takes longer to reproduce offspring
- More things can go wrong (Mutations)
- Must locate a mate to reproduce
Asexual Reproduction advantages
- Only need one parent to reproduce
- Requires less energy to reproduce
- Can reproduce quickly
Asexual Reproduction disadvantages
- Genetically similar and less able to survive environmental changes
- Can be easily wiped out by diseases
- Can result in overcrowding of a habitat
Gametes
Are the special reproductive cells that are involved in sexual reproduction.
What gamete is Sperm?
A male gamete
What gamete is the ovum?
Female Gamete
What is fertilization?
Sexual reproduction requires the joining of a sperm and an egg in a process called fertilization
Meiosis
Is the cell division that produces gametes
Budding
When an organism creates a bud from its own cells, which then detaches to form an identical offspring E.g. Hydra
Fission
When an organism splits into two and each half grows into a separates organism e.g Starfish
Parthenogenesis
When offspring develop eggs that have not yet been fertilized by a male e.g fleas, bees and some fish/reptiles
Ways of plants reproducing asexually
- Rhizome
- Bulb
- Root sucker
- Plantlet
- Tuber
Ovaries
Produce ovum (eggs). One ovum is released from the ovaries each month.
Fallopian Tube
The ovum travels along the fallopian tube to the uterus. Fertilization often occurs here.
Uterus
Once in the uterus, the ovum can implant and grow into a baby.
Cervix
The short passage of muscle between the uterus and the vagina. During childbirth it dilates to let the baby out.
Vagina
Is where semen enters the body. It is also the passage through which babies are born.
Testicles
Is where semen enters the body. It is also the passage through which babies are born.