Genetics Part 1. You have your genes to thank – or blame for how you look Genes are your...

GeneticsPart

1

You have your genes to thank – or blame for how you look• Genes are

your body's instruction manual.

• They affect the way you look, your health, and the way your body works.

Heredity is the passing on of characteristics from one generation to the next.

• It is the reason why offspring look like their parents.

• The study of heredity is called genetics and scientists that study heredity are called geneticists.

Genes and Inheritance

• Your genes are unique – unless you have an identical twin.

Genes and Inheritance

• Half of your genes are from your mother• the other half are from your father, • who, in turn, received their genes from

their parents, • and so on, right back to

your earliest ancestors

DOMINANT & RECESSIVE• Certain genes are

dominant, and you only need one of the pair to give you its trait.

• Dominant genes are represented as capital letters and recessive genes as lower-case letters.

Some Human Traits

Some Human Traits

6 Fingers and Toes

Are Dominant

Alleles

• Are all the possible genes for a trait

The Gene Locus

• Is the location of a gene on the on the chromosome

Genotypevs

Phenotype• Genotype

Is the actual genes that an individual has for a trait

• Phenotypethe physical expression of the genes

Let’s check your understanding with……….

A Game of X’s and O’s

7 8 9

4 5 6

1 2 3

7 8 9

4 5 6

1 2 3Scoreboard

X

O

Click Here ifX Wins

Click Here ifO Wins

1

What structure on chromosomes carry the instructions for a trait?

1

GenesHome

2

What is the passing of characteristics from one generation to the next?

2

HeredityHome

3

What is the study of heredity?

3

GeneticsHome

4

True or False: You get all of your genes from your mother.

4

FalseHome

5

You must have two of these genes in order for it to be expressed.

5

RecessiveHome

6

All the possible genes for a trait

6

AlleleHome

7

The location of a gene on a chromosome

7

LocusHome

8

True or False: The color purple is an example of genotype

8

FalseHome

9

True or False: Dominant genes are represented by capital letters

9

TrueHome

Adapted From

Presentation

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