MORE COMPLEX
INHERITANCE
11.3
I. SEX DETERMINATION
A. _______________Pairs of chromosomes that
look alike
1. Similar to _____ chromos
2. Humans have _____ pair
3. The 23rd pair don’t match
I. SEX DETERMINATION
B. Sex chromosomeschromos. that determine
the sex of an organism
1. __ can be passed on by
males or females
2. __ can be passed on by
males only!
I. SEX DETERMINATION
3. ___ indicates female
4. ___ indicates male
5. Y is mostly _______
6. The chance of being a
male/female is 50% (1:1).
a. Draw Punnett square
II. SEX LINKED
INHERITANCE
A. Sex-linked traits- Traits
controlled by _________ located
on sex chromosomes.
1. Since Y is blank, these traits
are more common in ________.
a. XAXa=Not affected
b. XaY=Affected
II. SEX LINKED
INHERITANCE
A. Sex-linked traits (cont.)
2. This ________________
pattern can be seen in
pedigrees, too.
1. Sample pedigree
2. Ex: Hemophilia,
Colorblind, ALD
III. Karyotype
A. Karyotype- A computer
generated picture of an
individual’s _____________
1. See Kyle’s
2. See google images
III. SCENARIO
Brian has a German Shepherd
named Tito. Brian is thinking
about using Tito for breeding.
Tito’s vision is good (Bb or
BB), but we don’t know if he
is homozygous for good vision
or heterozygous. How can
Brian find out?
III. SCENARIO
USE A TEST CROSS!!!
A. Test cross- Breeding an
unknown genotype to a known
genotype.
1. By breeding Tito to a dog that
we know is blind (___) we can
see if any of the pups are blind.
If so, we know Tito is
heterozygous (____)
a. Practice Punnett Square