Reproduction And Inheritance?

Question 1

What are the differences between asexual and sexual reproduction? - asexual

Answer 1

Involves only one parent
Gametes are not produced
No fusion of gametes
Creates genetically identical cells
Cell division that occurs is called mitosis

Question 2

What are the differences between asexual and sexual reproduction? - sexual

Answer 2

• requires to parents
• genetically varied offspring
• produces gametes
• fertilisation occurs as a male gamete fuses with a female gamete to form a zygote

Question 3

How is an embryo developed?

Answer 3

At fertilisation a male gamete fuses with a female gamete to form a zygote that end up with the full set of chromosomes - 47
The zygote undergoes cell division by mitosis and develops into an embryo
It receives a mixture of chromosomes from its mum and dada

Question 4

How is the male reproductive system adapted for its function?

Answer 4

• it creates sperm
• sperm are male gametes and are made in the testes all the time after puberty
• glands - produce the liquid mixed with sperm to make semen
• sperm duct - carries sperm from testis towards the urethra
• testis - where the sperm are made

Question 5

how do the female reproductive system make eggs?

Answer 5

• eggs are female gametes and are produced every 28 days from one of the tow ovaries
• it then passes into the fallopian tube this is where it met the sperm that have entered the vagina during sexual intercourse
• if it isn’t fertilised by sperm , the ovum will break and pass out the vagina
• if it is fertilised the ovum starts to divide. The new cells with transfer down the fallopian tube to the uterus and attach to the endometrium
• a fertilised ovum develops into an embryo

Question 6

What is the role of oestrogen in women?

Answer 6

Extra hair
Hips to widen
Development to breasts
Ovum release and start of periods

Question 7

What is the role of testosterone?

Answer 7

• extra hair on face and body
• muscles to develop
• penis and testicles enlarge
• sperm production
• deepening of voice

Question 8

What is the role of FSH in the menstrual cycle?

Answer 8

It is called the follicle - stimulating - hormone
- produced in the pituitary gland
- causes a egg to mature in the ovaries in a structure called a follicle
- stimulates the ovaries to produce oestrogen
- oestrogen inhibits the release of FSH

Question 9

What is the role of LH in the menstrual cycle?

Answer 9

Luteinising hormone
Produced by the pituitary gland
Stimulates the release of an egg at day 14 - ovulation