Genetics Notes Part 2
Define Independent Assortment
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Define the Law of Segregation
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Beyond Mendel
Define Codominant
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Define Incomplete Dominant
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What is a Genotype? ___________________________________________________________________
What is a Phenotype? ___________________________________________________________________
How many Genotypes are there in Codominant? _____________________________________________
How many Phenotypes are there in Codominant? ____________________________________________
Examples
Write the correct genotype for each color if R represents a red gene and B represents a blue gene.
Red - _____ Blue - ______ Purple - _____
What would happen if SpongeBob crossed a Poofkin with red flowers with a Poofkin with blue flowers.
Complete the Punnett square to determine the chances of each flower color.
(a) Give the genotypes and phenotypes for the offspring.
(b) How many of the plants would have red flowers? _____%
(c) How many of the plants would have purple flowers? _____ %
(d) How many of the plants would have blue flowers? _____ %
What can you say about Codominance?
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How many genotypes are in Incomplete Dominance?
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How many phenotypes are in Incomplete Dominance?
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Examples
Name
Blood Type
Mother
Type A
Baby
Type B
Sammy the player
Type O
George the sleeze
Type AB
The waiter
Type A
The cable guy
Type B
The possible genotypes for the blood types
are:
A- AA and AO
B- BB and BO
O-OO
AB-AB
Who cannot be the father? ___________
Who is the most likely father? _________
Name
Blood Type
Mother
Type B
Baby
Type AB
Bartender
Type O
Guy at the club
Type AB
Cabdriver
Type A
Flight attendant
Type B
Who cannot be the father? ______________ Who could be the father? ______________________
Explain why blood type data cannot prove who the father of a baby is, and can only prove who the father is not
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What are the sex chromosomes for a female? _______________________________________________
What are the sex chromosomes for a male? _________________________________________________
What does it mean for a trait to be sex linked?
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Examples of Sex Linked Traits would be
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Examples:
If mom is color blind and dad is normal what will the genotypes and phenotypes of
their offspring be?
If mom is a carrier for color blind and dad is colorblind what will the genotypes and
phenotypes of their offspring be?
If the Queen is a carrier for Hemophilia and the King is normal will they produce a
healthy male heir?
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What is a Dihybrid Cross?
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Examples
How do you set it up?
RRbb crossed with rrBB
In rabbits, grey hair is dominant to white hair. Also in rabbits, black eyes are dominant to red eyes.
GG = gray hair
Gg = gray hair
gg = white hair
BB = black eyes
Bb = black eyes
bb = red eyes
What are the phenotypes (descriptions) of rabbits that have the following genotypes:
Ggbb ____________________ ggBB ________________________
ggbb ____________________ GgBb _________________________
A male rabbit with the genotype GGbb is crossed with a female rabbit with the genotype ggBb The square
is set up below. Fill it out and determine the phenotypes and proportions in the offspring.
How many out of 16 have grey fur and black eyes? ____
How many out of 16 have grey fur and red eyes? _____
How many out of 16 have white fur and black eyes? ____
How many out of 16 have white fur and red eyes? _____
A male rabbit with the genotype GgBb is crossed with a female rabbit with the genotype GgBb The
square is set up below. Fill it out and determine the phenotypes and proportions in the offspring.
How many out of 16 have grey fur and black eyes? ____
How many out of 16 have grey fur and red eyes? _____
How many out of 16 have white fur and black eyes? ____
How many out of 16 have white fur and red eyes? _____
4. Show the cross between a ggBb and a GGBb. You'll have to set the square up yourself!