Thames & Kosmos Genetics & DNA Lab handleiding

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Thames & Kosmos

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Handleiding

The way that features were distributed

was still unclear to Mendel. But on this

topic, he had a few more ideas. After all his

experiments, it suddenly became clear as

day to him that each partner only passes

on one copy of each program to the

offspring and not all the copies. That

makes sense, because otherwise the

number of programs would double with

each generation.

Luckily, it is much more orderly than that:

Only one of two possible programs passes

from the parents to the children — so each

of the offspring logically ends up with two

copies again.

How features

are passed on

YOU WILL NEED

→ colored plastic chips

Possible

combinations

These are the

parent plants’

programs.

The X indicates that pea plant 1 (red-red) is

crossed with pea plant 2 (white-white). From

that crossing, we get four possible pea plant

offspring, all with red ﬂowers.

Now we can explain which four combinations

of the programs can arise from two different

pea plants when they are crossed.

HERE’S HOW

1. For the ﬁrst pea plant breeding exercise,

one pea should have two programs for red,

and the other should have two for white.

By placing the colored chips in the grid

drawing below, you can easily ﬁgure out all

possible combinations.

2. In each case, one program from one parent

is crossed with one program from the

other.

Because we are dealing with peas here, all

the offspring are red, since the program for

red color always dominates. Not a trace of

white to be seen — at least, not from the

outside, by looking at the ﬂower color.

EXPERIMENT 8

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