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Dihybrid Crosses and Intermediate Inheritance

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by

Alex Aschenbach

on 12 February 2014

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Transcript of Dihybrid Crosses and Intermediate Inheritance

Dihybrid Crosses and
Other Forms of Dominance

Dihybrid Crosses
Different from Monohybrid Crosses.
Monohybrid shows the outcomes of one possible trait.
Dihybrid crosses show the possible outcomes
of TWO traits (gene).

Dihybrid crosses are just bigger
Punnett Squares.
Intermediate Inheritance
In both monohybrid and dihybrid crosses
we looked at alleles where one allele was
enough to produce a dominant phenotype.

This isn't always the case. For some genes,
neither allele is dominant nor recessive.

Instead, the phenotype of the offspring is
more of a mix of the two parents.
This mix of traits does NOT
support the Blending Hypothesis.
In cases of Intermediate Inheritance the F1
generation is an intermediate of the
P generation. However, the F2 generation
can produce offspring that resemble the P
generation.
In the example we just saw, the parents were both
homozygous for their traits. This produces a
F1 generation where all offspring are heterozygous.


The F2 generation produces offspring that have a
ratio of 1:2:1, 1 black, 2 blue, and 1 white.
Now it's your turn to try out some problems.


And before you ask, yes, this will be collected, and if you do not finish it in class it is homework. Do your best!
Mendel wanted to see what would happen if you
crossed two different genes. (seed color and shape)

He crossed RRYY with rryy.
R = round
r = wrinkled
Y = yellow
y = green
P = purple
p = white
S = smooth
s = wrinkled
R
R
R
R
Y
Y
Y
Y
r
y
r
y
r
y
r
y
Next, Mendel crossed a RrYy wth another RrYy.

This crossing ended with the following ratio:
9:3:3:1
Make every possible
combination of alleles
before you cross.
For example...
Let's try
some more.
A group of scientists want to understand a species
of lizard. They know this:

G = green scales
g = orange scales
B = buff muscles
b = weak muscles

They cross two heterozygous lizards, what are the
offspring?
Let's bring back Angry Birds, here are their traits:

A = angry
a = happy
B = they bounce
b = do not bounce
Full transcript