Download Beyond Mendelian Inheritance

Beyond Mendelian Inheritance
Incomplete dominance - When the resulting phenotype is a blend of a heterozygous allele pair:
 red flower + blue flower = purple flower
 The allele for red flower would be FR and the allele for blue flower would be FB. Can you complete the
genotypes and phenotypes on your paper?
Genotype
Phenotype
Codominance - When the resulting phenotype shows both traits of an allele pair:
 red flower + blue flower = red and blue spotted flowers
 The allele for red flower would be R and the allele for blue flower would be B. Can you complete the
genotypes and phenotypes on your paper?
Genotype
Phenotype
Multiple Alleles - When there are more than 2 variations.
 EX: Human blood types have 3 different alleles, A, B, and O.
Genotypes
Phenotypes
AA, AO
A blood type
AB
AB blood type
BB, BO
B blood type
OO
O blood type
Regulatory Genes -Regulate the expression of other genes. It may “silence” another gene from expressing its
dominant trait.
 EX: Manx cats have no tails because there is a gene that “silences” the gene for a tail. The tail
silencing gene has the possible alleles:
 S – “silences” tail = no tail
 s – doesn’t “silence” tail = tail
 Question: Can Manx cats without tails have a kitten with a tail? Show your answer with a Punnett Square.
Applying these patterns to Harry Potter:
1. Hagrid’s father was a wizard and his mother was a giantess. The normal heights for giants and wizards are:
Giants = 20 ft & Wizards = 5 ft 6in. Given that Hagrid is described as being 12 ft tall, what type of genetic
inheritance may be at work?
2. In the Harry Potter series, characters are born with or without magical ability. Those with magical abilities
also show very strong, normal, and weak abilities. Therefore, there are two genes involved in magical
abilities:
Gene 1 = Expression – the character has or doesn’t have magical ability
Gene 2 = Strength – the character has strong, average, or weak magical abilities
A. Given the information above, complete the chart for the possible phenotypes and genotypes for gene 1.
Phenotype
Genotype(s)
**This is an example of what type of inheritance? __________________________________________
B. Given the information above, complete the chart for the possible phenotypes and genotypes for gene 2.
Phenotype
Genotype
**This is an example of what type of inheritance? __________________________________________
3. Using charts you completed in number 2 and the following phenotypes for the characters from the books,
can you come up with their genotypes? HINT – You’ll have 4 letters for each.
Character
Phenotype
Harry
Very strong magical ability
Ron
Average magical ability
Aunt Petunia*
No magical ability
Mr. Filch
Weak magical ability
* Aunt Petunia has MANY possible genotypes!
Genotype(s)
4. Since Hermione has average magical ability, what are the possible genotypes of her parents? HINT: Write
Hermione’s genotype first: _________
Applying these patterns to Harry Potter:
1. Hagrid’s father was a wizard and his mother
was a giantess. The normal heights for
giants and wizards are: Giants = 20 ft &
Wizards = 5 ft 6in. Given that Hagrid is
described as being 12 ft tall, what type of
genetic inheritance may be at work?
2. In the Harry Potter series, characters
are born with or without magical ability.
Those with magical abilities also show very
strong, normal, and weak abilities.
Therefore, there are two genes involved in
magical abilities:
Gene 1 = Expression – the character has or doesn’t have
magical ability
Gene 2 = Strength – the character has strong, average, or
weak magical abilities
a. Given the information above, complete the
chart for the possible phenotypes and
genotypes for gene 1.
Phenotype
Genotype(s)
**This is an example of what type of inheritance?
__________________________________________
2. In the Harry Potter series, characters
are born with or without magical ability.
Those with magical abilities also show very
strong, normal, and weak abilities.
Therefore, there are two genes involved in
magical abilities:
Gene 1 = Expression – the character has or doesn’t have
magical ability
Gene 2 = Strength – the character has strong, average, or
weak magical abilities
Given the information above, complete the
chart for the possible phenotypes and
genotypes for gene 2.
Phenotype
Genotype
**This is an example of what type of inheritance?
__________________________________________
3. Using charts you completed in number 2 and
the following phenotypes for the characters
from the books, can you come up with their
genotypes? HINT – You’ll have 4 letters for
each.
Character Phenotype
Genotype(s)
Harry
Very strong
magical
ability
Ron
Average
magical
ability
Aunt
No magical
Petunia* ability
Mr. Filch
Weak
magical
ability
* Aunt Petunia has MANY possible genotypes!
4. Since Hermione has average magical
ability, what are the possible genotypes of her
parents? HINT: Write Hermione’s genotype
first: _________
(You will need data from table in 3)