Unit 2: Reproduction [Grade 9]
Reproduction
Introduction
Reproduction is forming new individuals and the continuation of living species.
There is asexual and sexual reproduction. Asexual = one organism, sexual = 2 organisms
Why is reproduction important?
- Avoids extinction
- Genetic diversity (derived from sexual reproduction)
- Continue existence
- Interaction
Human Reproductive System
Similarities
- Both reproductive systems have 2 pouches
- Testes and ovaries
- Both start inside the body
- Fetus begins with “starter parts” that could develop into either gender
XX = female
XY = male
The father determines the baby’s sex.
Male Female
- Function is sperm production - One egg is released once a month
- Produce sperm (from puberty until menopause)
- 2-4 million sperm every day - Careful coordination of hormones &
once puberty is hit body
- Create a perfect environment for
fertilized egg to develop
, Male Reproductive System
Sperm
- Hold very important genetic information (DNA) which is like blueprints to make a
baby
- Carry it from the male to the female
- Made up of 2 parts:
- Head (holds the nucleus - genetic info)
- Tail aka flagellum, acts like a propeller to help the sperm move towards the
egg
Testes
- Testis = 1, testes = 2
- Aka testicles
- Where sperm are produced/created, usually daily once puberty hits
- Sperm are specifically made in the seminiferous tubules, which are long coiled up
tubes inside the testes
- Cells in the testis produce a hormone called testosterone
- Responsible for secondary sexual characteristcs
- Voice deepens, facial hair, pubic hair, underam hair… etc.
- Testes create sperm, which are specifically created in the seminiferous tubes.
Cells in the testis produce testosterone which changes certain characteristics
Scrotum
- A sac of tissue that holds the testes
- Keeps the testes outside the body creating the cooler temperature needed to
produce healthy sperm
Epididymis
- Where mature sperm are stored until it leaves the body
Vas Deferens
- Sperm swim/travel through the tubes
- This tube also carries urine out of the body in males
- Last section of this tube is known as the urethra
- Both semen and urin exit the body here, but not at the same time
Reproduction
Introduction
Reproduction is forming new individuals and the continuation of living species.
There is asexual and sexual reproduction. Asexual = one organism, sexual = 2 organisms
Why is reproduction important?
- Avoids extinction
- Genetic diversity (derived from sexual reproduction)
- Continue existence
- Interaction
Human Reproductive System
Similarities
- Both reproductive systems have 2 pouches
- Testes and ovaries
- Both start inside the body
- Fetus begins with “starter parts” that could develop into either gender
XX = female
XY = male
The father determines the baby’s sex.
Male Female
- Function is sperm production - One egg is released once a month
- Produce sperm (from puberty until menopause)
- 2-4 million sperm every day - Careful coordination of hormones &
once puberty is hit body
- Create a perfect environment for
fertilized egg to develop
, Male Reproductive System
Sperm
- Hold very important genetic information (DNA) which is like blueprints to make a
baby
- Carry it from the male to the female
- Made up of 2 parts:
- Head (holds the nucleus - genetic info)
- Tail aka flagellum, acts like a propeller to help the sperm move towards the
egg
Testes
- Testis = 1, testes = 2
- Aka testicles
- Where sperm are produced/created, usually daily once puberty hits
- Sperm are specifically made in the seminiferous tubules, which are long coiled up
tubes inside the testes
- Cells in the testis produce a hormone called testosterone
- Responsible for secondary sexual characteristcs
- Voice deepens, facial hair, pubic hair, underam hair… etc.
- Testes create sperm, which are specifically created in the seminiferous tubes.
Cells in the testis produce testosterone which changes certain characteristics
Scrotum
- A sac of tissue that holds the testes
- Keeps the testes outside the body creating the cooler temperature needed to
produce healthy sperm
Epididymis
- Where mature sperm are stored until it leaves the body
Vas Deferens
- Sperm swim/travel through the tubes
- This tube also carries urine out of the body in males
- Last section of this tube is known as the urethra
- Both semen and urin exit the body here, but not at the same time
