same basic method. Procedure Make up your own genotype example and work out the crosses. 1 Traits: 2 Symbols: 3 Male Genotype: 4 Female Genotype: 5 Offspring Genotypes:
same basic method. Procedure Make up your own genotype example and work out the crosses. 1 Traits: 2 Symbols: 3 Male Genotype: 4 Female Genotype: 5 Offspring Genotypes:
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:182
Chapter 15
Using the Punnett Square
The Punnett Square is a simple method of predicting the probable
outcome of genetic crosses.
Step 1
Draw a square like this:
Put the gametes of
one parent here.
Put
the gametes
of the other
parent here.
Step 2
Determine what kinds of gametes are made by each parent in the cross,
and put those gametes into the boxes of the Punnett Square.
If your mate is
heterozygous
(Ff), then those
gametes are
For example, if you
are homozygous
recessive for
attached earlobes
(ff), then all of your
gametes are
Step 3
Fill in the offspring boxes of the Punnett Square.
Why is it
unnecessary to fill
in this box with
another smallf?
ff
F Ff
In this example there are only two possible offspring genotypes. The
Punnett Square tells us to expect about 50% ff and 50% Ff.
Sometimes the Punnett Square is more complex than this and you
must figure out more than one trait at a time. Nevertheless, you use the
same basic method.
Procedure
Make up your own genotype example and work out the crosses.
1 Traits:
2 Symbols:
3 Male Genotype:
4 Female Genotype:
5 Offspring Genotypes:
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