Name _______________

Complete the various parts of the booklet as you go through the assignment.

IMPORTANT DATES:Draft point: Preferred Date:Due Date:Marks % Grade

Understanding Science

(US)

Investigating Science

(IS)

21

34

Part A

Hollywood is a buzz with news about Hollywood's hottest couple, Angelina and Brad! Rumours of Angelina being pregnant has resulted in a modelling agency offering the couple a contract for the child as long as it doesn’t have a widow’s peak.Use punnet square (s) to determine the odds of the child getting the modelling contract.

How can I have a widow’s peak I have no hair!

Widow’s Peak No Widow’s Peak

Punnet Square (s)

The child has a _____ % chance of getting a modelling contract 6 Marks (US)

Part C

From photo of your face, label your traits and determine your phenotype and genotype using the booklet to assist you.

(If you can’t tell if you are homozygous dominant or heterozygous then flip two coins. Heads = dominant allele talis = recessive allele…so two heads gives homozygous dominant, head and tail gives heterozygous.)

Fill in the alleles for the appropriate genes on your chromosome sheet.

Choose a celebrity of the opposite sex and repeat the process to fill out their chromosome sheet.

Present results of Part C as a poster that should include:

-A photo of yourself with traits labelled.

-A photo of your celebrity with traits labelled.

-Display the chromosomes of the baby.

-Draw the face of the baby when its an adolescent and label all the traits.

15 Marks (IS)

YOU ?+

Genotype to Phenotype

Use the rest of this booklet assist you in answering Parts A to D

It’s my parents fault I’m so

UGLY!

Blank chromosome sheets are found at the back of the booklet, feel free to tear them off BUT make sure you don’t loose them!

Gender

X X

X Y

If you have an X and Y chromosome, then the baby is a

boy!

If you have two X chromosomes, then the baby is a

girl!

Face Shape

Chromosome #1 contains the genetic information in a gene we will call “R”. This information determines the general shape of the face.

Chin Prominence

Chromosome #2 contains the chin prominence gin, “L”. The genotype “ll” prevents the expression of the next two pairs of genes. This control of another gene’s expression is called epistasis. If you have the genotype “ll” skip the next two and start at skin colour.

Very prominent (LL, Ll) Less prominent (ll)

1 1

2 2

Chin Shape

Chromosome #3 contains the “S” gene. This controls the shape of the chin, round or square.

Chin Cleft

Chromosome #5 carries the “C” gene responsible for the development of a chin cleft.

Round (SS, Ss) Square (ss)

Absent (CC, Cc) Present (cc)

3 3

5 5

Skin ColourSkin colour is determined by three sets of genes on chromosomes # 1, 2 and 4. The dominant genetic code, gene A makes a protein called melanin ( a dark pigment that assists in blocking UV light).

The greater number of dominant alleles “A” the darker the skin. Count the number of dominant alleles “A” and use the table below to determine the skin colour.

6 Dominant alleles (“A”) Very dark brown, nearly black skin

5 Dominant alleles (“A”) Dark brown skin

4 Dominant alleles (“A”) Brown skin

3 Dominant alleles (“A”) Light brown skin

2 Dominant alleles (“A”) Tan skin

1 Dominant alleles (“A”) Light tan / pink skin

0 Dominant alleles (“A”) Cream, nearly white skin

Hair Colour

HHHHHH

hhhhhh

HHHhhh

Jet Black

Brown

Blonde

White

Hhhhhh

HHhhhhLight Brown

HHHHhhDark brown

HHHHHhBlack

Hair colour like skin colour is polygenic, with the same gene found on more than one chromosome (3, 6 and 10). The dominant allele encodes for a dark pigment, the greater number of dominant alleles the darker the hair.

1 1

2 2

4 4

6 610 10

3 3

18 18

Red Hair Colour

Red hair is encoded by another gene on a different chromosome (4). It blends with other hair colours. The darker hair colours mask the red pigment.

GG = Heavy red pigment

Gg = Medium red pigment

gg = No red pigment

If you have blonde or white hair and have GG you will have flaming red hair!

Types of hair

Chromosome #7 contains the gene for hair type. The dominant allele encodes for amino acids containing a sulphur atom which causes cross linking between the amino acids in the hair….giving you curls. Straight hair lacks these cross links.

Curly (WW) Wavy (Ww) Straight (ww)

4 4

7 7

Widow’s Peak

Chromosome #8 contains the gene for the widow’s peak.

Eye Brow Thickness

Chromosome #9 carries the gene for eye brow thickness

Bushy (TT, Tt)

Fine (tt)

Present (PP, Pp) Not Present (pp) 8 8

9 9

Eye Brow Placement

Not connected (EE, Ee)

Connected (ee)

Chromosome #10 has the gene for eye brow placement. The dominant alleles separates the eye brows.

Eye Placement

Chromosome #11 has the gene for eye placement.

Average distance (Oo)

Far apart (oo)

Close together (OO)

10 10

11 11

Eye Size

Chromosome #12 besides carrying the gene for eye colour it also carries the gene for eye size. % indicates a recessive allele while % indicates a dominant allele.

Eye Shape

Chromosome #13 has the gene for eye shape.

Large (I I ) Medium ( I i ) Small ( i i )

Almond (VV, Vv) Round (vv)

12 12

13 13

Eyelashes

Movie star eyelashes are found on chromosome #15. The dominant allele gives you long eyelashes.

Eye ColourChromosomes #11 and 12 contain the eye colour genes. Dark eyes are produced in the presence of more active alleles. In this case dominant alleles F and B are active in depositing dark pigments. Alleles f and b deposit little pigment.

Two pairs of genes are involved, one for pigment deposit at the front of the iris, the other at the back.

FFBB Dark Brown

FFBb Brown

FFbb Brown

FfBB Brown

FfBb Brown

Ffbb Light brown

ffBB Green

ffBb Green

Ffbb Blue

Long (MM, Mm) Short (mm)

15 15

11 11 12 12

Width of mouthWide Mouth (QQ)

Medium Mouth (Qq)

Small Mouth (qq)

Chromosome #17 has the gene that controls mouth width.

Lip thickness

Chromosome #18 has the gene that controls lip thickness.

Thick (JJ, Jj) Thin (jj)

17 17

18 18

Dimples when smiling

Chromosome #16 contains the gene that enables dimples to form when smiling.

Nose Size

Chromosome #19 carries the gene that contains information regarding nose size

Dimples (KK, Kk) No Dimples (kk)

Nose ShapeRounded (UU, Uu) Pointed (uu)

Chromosome #14 contains the gene that encodes nose shape.

14 14

16 16

19 19

Free Earlobes

Chromosome #22 carries the gene for free ears.The dominant allele causes the lobe to hang freely.

Free (ZZ, Zz) Attached (zz)

Hairy Ears

Chromosome #20 contains the gene that causes hairy ears.

No Hair (DD, Dd) Hairy (dd)

20 20

22 22

Freckles on cheekFreckles on

cheek ($$, $$)No Freckles on

cheek ($$)

Chromosome #21 contains a gene which causes uneven pigment to form in the cheek region. ( $ indicates recessive allele).

Freckles on foreheadChromosome #9 there is a gene that causes freckles on the forehead to occur.No freckles forehead dominant ( # )Freckles on forehead recessive ( # )

9 9

21 21

Colour BlindnessThis trait is said to be sex linked. The gene encoding colour blindness is found on the X chromosome but NOT on the Y chromosome. The recessive allele encodes for colour blindness ( * ) the dominant allele for normal vision ( * ).

X X

2 2

4 45 5

6 67 7

8 8 9 9 10 10 11 11 12 12 13 13 14 14

Julia Robert’s Chromosomes

1 1

r r

a a

aa

LL

3 3

ss

HH

A a

G gcc

H H

W w

pp @ @

TTH H

E E F F

o oI I

B B V V

U U

15 15 16 16 17 17 18 18 19 19

21 21 22 22

X X

Julia Roberts’ Chromosomes

M M

K K

Q q

H h

J j

N n

20 20

d d

$ $Z z

* *

1 12 2

4 45 5

6 67 7

8 8 9 9 10 10 11 11 12 12 13 13 14 14

George Clooney’s Chromosomes

3 3R r

A a

A a

L L

S s

H H

A a

g gC c

H H

ww

P p

T t

@ @

H H

E e

O o

F F B B

I i

V v

U u

15 15 16 16 17 17 18 18 19 19

20 20 21 21 22 22

X Y

George Clooney’s Chromosomes

M M

K k

Q q

H H

J j

n n

D d

$ $Z z

*

1 12 2

4 45 5

6 67 7

8 8 9 9 10 10 11 11 12 12 13 13 14 14

Your Chromosomes

3 3

15 15 16 16 17 17 18 18 19 19

20 20 21 21 22 22

X X X Y

If female use thesechromosomes

If male use thesechromosomes

Your Chromosomes

1 12 2

4 45 5

6 67 7

8 8 9 9 10 10 11 11 12 12 13 13 14 14

Your Celeb’s Chromosomes

3 3

15 15 16 16 17 17 18 18 19 19

20 20 21 21 22 22

X X X Y

If female use thesechromosomes

If male use thesechromosomes

Your Celeb’s Chromosomes