Inheritance and Survival

1. Inheritance of sex

2. Extra “mini” coursework

3. Nature versus Nurture

Lesson Aims

To understand how sex is inherited and the importance of chromosome pair 23

Investigate effect of cigarette smoke on the growth of the foetus

Explore the relationships between our genes and the environment

Inheritance of sex

Sex chromosomes

Every cell in the human body has 46 chromosomes.

There are 22 pairs of chromosomes.

The two other chromosomes do not always look alike.

Sex chromosomes

They are called the sex chromosomes.

Every female cell has two sex chromosomes which are alike (XX)

Sex chromosomes

Every male cell has two chromosomes which are not alike (XY)

cells in testis of male cell in ovary of female

XY XX

cells in testis of male cell in ovary of female

XY XX

there are two types of sperm

X

Y

cells in testis of male cell in ovary of female

XY XX

there are two types of sperm

X

Y

there is only one type of ovum

X

X

cells in testis of male cell in ovary of female

XY XX

there are two types of sperm

X

Y

there is only one type of ovum

X

X

cells in testis of male cell in ovary of female

XY XX

there are two types of sperm

X

Y

there is only one type of ovum

X

X

X

Y

cells in testis of male cell in ovary of female

XY XX

there are two types of sperm

X

Y

there is only one type of ovum

X

X

X

Y

X X

cells in testis of male cell in ovary of female

XY XX

there are two types of sperm

X

Y

there is only one type of ovum

X

X

XY XY

XX XXX

Y

X X

Sex chromosomes

The sex of the baby depends on which type of sperm fertilises the ovum.

The chances of the baby being a boy (XY) or a girl (XY) are equal.

Smoking babies!

A mini coursework exercise

Follow the instructions on the sheet you are given.

All to be done on paper and lined paper!

Nature versus nurture

Read the sheet given out!

IQ Test

Do the IQ test!

IQ test answers

1. 42. DUAL3. 104. 25. NIROY (irony; steel; copper; bronze)6. PILE7. 528. 669. KOYNED (purple; donkey; azure; violet)10. 4411. 112. 613. ONE

IQ test answers

14. 6

15. 77

16. 3

17. V and M (spells PAVEMENT)

18. BUSH

19. 484 (783-541 x 2)

20. SING

21. 24 (0+3, 3+5, 8+7, 15 + 9) What?????

22. STUN

23. TIGHT

24. 5

25. NOSE

IQ test answers

26 35 (1+7, 8+8, 16+9, 25+10)27 628 CRACK29 W30 431 432 I and P (DEPOSITS)33 NIPS34 STOMACH35 S over V36 POST38 5539 640 GLAD

Nature versus Nurture

Discussion sheet

Nature versus nurtureCharacteristic Genes or Environment

Height

Eye colour

Skin colour

Weight

Scars

Nose shape

Finger length

Hair length

Baldness

Honesty

Intelligence