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Mendelian Inheritance. The genes are in our cells. In the nucleus. Where are they kept?. The genes are on long, string-like things called. chromosomes. We have 46 of them in our cells. What do you notice about them?. All our chromosomes are in pairs. and half came from dad.

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Presentation Transcript
slide2

The genes are in our cells.

In the nucleus

Where are they kept?

slide4

We have 46 of them in our cells.

What do you notice about them?

slide5

All our chromosomes are in pairs

and half came from dad

half came from mom

Where did we get each one from?

slide7

Sex cells are special when it comes to chromosomes.

They only have one of each pair, not the usual two.

Sex Cells

Why is this?

Sex cells are designed to join together and so...

1 + 1 = 2

slide8

This means that genes are in pairs

Because…

E

E

Genes are found on chromosomesand chromosomes come in pairs—homologs!

slide9

Some gene are in two forms

Some people have ear lobes and

others do not (attached).

slide10

A gene controls how ear lobes develop.

Let’s use letters to represent genes/alleles to make it easier.

There are two versions of the gene.

They are called alleles.

E

which produces ears with lobes.

and

e

which produces ears without lobes.

slide11

So...

2

forgetting all those chromosomes

lets talk about ears

EE

two lobe alleles

two no lobe alleles

ee

or

Ee

one of each allele

but you definitely have

slide12

We can use these facts

to make predictions

about the features that

children will inherit from

their parents.

slide13

Lets pretend...

that a man without ear lobes

and a woman with lobes

will soon have their first baby

Will the baby have ear lobes?

slide14

mom

dad

Lobes

No lobes

parent’s

genotype

EE

ee

sex cell’s

alleles

E

e

e

Children’s

genotype

E

Ee

But… does the child have ear lobes?

slide15

YES

One allele

effect’s (E)can hide

the other’s effect (e).

Ee

This allele version is...

dominant

The allele that is hidden is…..

recessive

slide17

mom

dad

Lobes

Lobes

parent’s

genotype

Ee

Ee

sex cell’s

alleles

E

e

E

e

E

e

Children’s

genotype

E

EE

Ee

e

Ee

ee

But… do the children have ear lobes?

slide18

Lobes

Lobes

Ee

EE

Lobes

No lobes

ee

Ee

Phenotype: the appearance of the trait in the organism.

slide20

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