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Complex Inheritance Guided Notes
Essential
How can you use a parent's genetic information to determine the probability of
Question
offspring having certain genotypes and phenotypes?
Activating
Strategy
HomozygousHeterozygousDominantRecessiveGenotypePhenotype-
Incomplete dominance is when the _____________________ of a heterozygous
individual is an ________________ between those of the 2 homozygotes.
Ex:
Codominance is when the phenotypes of both _____________________ in a
heterozygous individual are expressed equally.
Ex:
Multiple alleles is an inheritance pattern where traits are controlled by more than
_______ alleles.
Ex:
Sex Determination
1. Humans have ___________ pairs of chromosomes
2. Of the ________ pairs of chromosomes in humans, _______ are autosomes
(pairs that look alike) and _________ are sex chromosomes.
3. ________________________ is a diagram of the chromosomes (arranged in
order for study
4.
5. Sex chromosomes are indicated by the letters ________ and ________
6. Females sex chromosomes are ______________
7. Male sex chromosomes are ____________
8. Who controls the sex of offspring? Why?
Sex-linked Inheritance
1. What are sex-linked traits?
______________________________________________________________
______________________________________________________________
2. Can sex-linked traits be on the X or Y chromosome? ____________ Which is
more common? _________________________
3. Alleles are written as __________________ for sex-linked traits. What does it
look like? ________________________________________
4. X and Y are NOT homologous, so there are no corresponding alleles, so
notation should NEVER be _________________________! Sex-linked traits
are EITHER X-linked OR Y-linked!
5. Why are certain disorders (color blindness, hemophilia, muscular dystrophy)
more common in males?___________________________________________
______________________________________________________________
Example: Color blindness
C = normal Allele is XC
c = color blind Allele is Xc
Male with color blindness = __________________
Female with color blindness = ___________________
Female carrier of color blindness = ___________________
Normal (non-carrier) = ______________________________________________
Why can only females be carriers of X-linked traits?________________________
_________________________________________________________________
Can males or females pass on y-linked traits? ______________________
Practice Sex-linked Problem:
Hemophilia is a lethal recessive sex linked trait. It causes your blood to be unable to
clot. So, if you fall and cut your chin open, the blood will keep spurting out of your chin!
If Queen Victoria carries a recessive trait for hemophilia XHXh and marries Albert who
has hemophilia XhY. How many of their children will die from hemophilia?
Polygenic inheritance are traits controlled by more than one ____________.
Ex: