Download 2/9

•Exam #1 F 2/16 in WCH 1.120
(bring cheat sheet)
•Review Th 2/15 at 5pm in GRG 102
CB 13.5
{Meiosis:
producing gametes}
Sexual reproduction
creates genetic
diversity by
combining DNA
from 2 individuals,
but also by creating
genetically unique
gametes.
{Mitosis:
producing more cells}
CB 13.9
Differences between mitosis and meiosis
Asexual
Reproduction
Mitosis only:
extremely low
genetic diversity
vs.
Sexual
Reproduction
Meiosis
and Mitosis:
greater genetic
diversity
Gene for
growth
hormone
Gene for
brown hair
pigment
Gene for
blue eye
pigment
Gene for
hemoglobin
CB 14.4
Gene for
DNA polymerase
Haploid
chromosomes
Allele for
low express
(short)
Gene for
growth
hormone
Allele for
high express
(tall)
CB 14.4
Allele for
black hair
Gene for
hair color
Allele for
black hair
Allele for
sickle cell Hb
Gene for
hemoglobin
Allele for
normal Hb
Diploid
chromosomes
CB 13.3
Each pair of
chromosomes
is comprised
of a paternal
and maternal
chromosome
haploid
X 23
in humans
X 23
in humans
diploid
X 23
in humans
Inheritance = The interaction between genes
inherited from Mom and Dad.
CB 14.10
Do parents’
genes/traits blend
together in
offspring?
CB 14.3
In many
instances there
is a unique
pattern of
inheritance.
Traits
disappear and
reappear in
new ratios.
CB 14.6
Genotype
Phenotype
Allele for
low express
(short)
Gene for
growth
hormone
Allele for
high express
(tall)
CB 14.4
Allele for
black hair
Gene for
hair color
Allele for
black hair
Allele for
sickle cell Hb
Gene for
hemoglobin
Allele for
normal Hb
Diploid
chromosomes
CB 14.6
Genotype
Phenotype
Human blood types
CB tbl 14.2
One gene with three alleles controls carbohydrates
that are found on Red Blood Cell membranes
A
A
A
A
A
RBC
A
A
A
A
Allele A = A carbs
CB tbl 14.2
B
B
B
B
B
RBC
B
RBC
B
B
B
Allele B = B carbs
Allele O = no carbs
Human blood types
CB tbl 14.2
We each have two versions of each gene…
A
So
A
A
A
A
RBC
A
A
A
A
Genotype could be
A and A
OR
A and O
Recessive alleles do not show their phenotype
when a dominant allele is present.
A
A
A
A
A
RBC
A
A
A
A
Genotype could be
A and A
OR
A and O
What about…
RBC
Genotype = ??
What about…
RBC
Genotype = OO
What about…
B
A
A
B
A
RBC
B
A
B
B
A
What about…
B
A
A
B
A
RBC
B
A
B
Genotype = AB
B
A
Human blood types
AA or
AO
BB or
BO
AB
OO
CB tbl 14.2
If Frank has B blood type,
his Dad has A blood type,
And his Mom has B blood type…
Should Frank be worried?
Mom=B blood
possible BB or BO
genotypes
Dad=A blood
AA or AO
possible
genotypes
Mom=B blood
Dad=A blood
BB or BO
AA or AO
Gametes all B / 50% B and all A / 50% A and
50% O
50% O
possible
genotypes
Mom=B blood
Dad=A blood
BB or BO
AA or AO
Gametes all B / 50% B and all A / 50% A and
50% O
50% O
Frank can be BO
= B blood
…no worries
Grandparents
AB and AB
Mom=B blood
possible
BB or BO
genotypes
Gametes all B / 50% B and
50% O
Frank can be BO or BB
= B blood
Dad=A blood
AA
all A
…Uh-Oh
CB 14.3
In many
instances there
is a unique
pattern of
inheritance.
Traits
disappear and
reappear in
new ratios.
haploid
X 23
in humans
X 23
in humans
diploid
X 23
in humans
Inheritance = The interaction between genes
inherited from Mom and Dad.
•Exam #1 F 2/16 in WCH 1.120
(bring cheat sheet)
•Review Th 2/15 at 5pm in GRG 102