Thames & Kosmos Genetics & DNA Lab handleiding

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Thames & Kosmos

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Handleiding

We know that the threads that you

isolated in the last experiment are genetic

material. But to discover that, a lot of

researchers beginning well over 100 years

ago had to painstakingly ponder and

perform one experiment after another. It

was just like a big puzzle to which one

researcher contributed one piece and

another added the next, over many

decades.

At the core of all this research was the

mystery concerning how heredity worked.

It wasn’t hard to determine that it existed.

Has anyone ever said to you, “Wow, you’re

the spitting image of your father?” Or,

“Your grandmother had your same eyes?”

HERES HOW

1. Think of ways in which you are similar to

your siblings, parents, or grandparents.

2. Write them down below.

Identifying

relatedness

YOU WILL NEED

→ note pad below

→ pen or pencil

People noticed a long time ago that they

resembled their ancestors. Obviously,

every generation passes some sort of

program on to the next, which makes

people look like the generation before. A

lot of researchers had some curious

ideas about how this might work. People

knew early on that new individuals arise

through mating. The basic facts are like

this: In order to produce a baby, one egg

cell from the mother has to merge with

one sperm cell from the father. But for a

long time it wasn’t at all clear how a new

human being would arise from that. At

the end of the th century, some

researchers developed the idea that

there were tiny copies of the father

sitting in the sperm cells, which then

grew into full-grown people. Proponents

of this “sperm cell” theory were called

animalculists. A quite different opinion

was held by the ovists — who thought

that the tiny offspring were actually

sitting in the egg cell. Pure nonsense!

But to explain things properly, a great

researcher had to step up to the plate.

→

WHATS HAPPENING

EXPERIMENT 

Heredity: Investigating Traits | 

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