homework #3 due now bonus #2 posted homework #4 is due 12/3/07 (only if needed) no class w 11/21
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Homework #3 due now Bonus #2 posted Homework #4 is due 12/3/07 (only if needed) No class W 11/21. Genotype. Phenotype. Dominant. Recessive. Human blood types. AA or AO. BB or BO. AB. OO. If Frank has B blood type, his Dad has A blood type, And his Mom has B blood type… - PowerPoint PPT PresentationTRANSCRIPT
If Frank has B blood type,
his Dad has A blood type,
And his Mom has B blood type…
Should Frank be worried?
Gametes all B / 50% B and50% O
all A / 50% A and50% O
possible
genotypes
Mom=B blood
BB or BO
Dad=A blood
AA or AO
Mom=B blood
BB or BO
Dad=A blood
AA or AO
Gametes all B / 50% B and50% O
all A / 50% A and50% O
possible
genotypes
Frank can be BO= B blood …no worries
Mom=B bloodBB or BO
Dad=A bloodAA
Gametes all B / 50% B and50% O
all A
possible
genotypes
Frank can be BO or BB= B blood …Uh-Oh
GrandparentsAB and AB
Mom = AB Dad = AB
Gametes: A or B A or B
A or B
A or B
AA
AB BB
AB
Chance of each phenotype for each offspring25% AA50% AB25% BB
Mom
Dad
Inheritance of blood types
Single genes controlling a single trait are unusual. Inheritance of most genes/traits is much more complex…
Dom. Rec. Rec. Dom.
PhenotypeGenotype
Genes code for proteins (or RNA). These gene products give rise to traits…
It is rarely this simple.
Figs 1.15-17
Ratio of Males to Females, by Age Group(number of males per 100 females, total resident population)Age 1950 1960 1970 1980 1990 2000 2004Under14 years
103.7 103.4 103.9 104.6 104.9 104.9 104.7
14 to 24years
98.2 98.7 98.7 101.9 104.6 105.1 105.8
25 to 44years
96.4 95.7 95.5 97.4 98.9 100.2 101.4
45 to 64years
100.1 95.7 91.6 90.7 92.5 94.8 95.0
65 yearsand over
89.6 82.8 72.1 67.6 67.2 70.8 71.7
All ages 98.6 97.1 94.8 94.5 95.1 96.3 96.9
Sex-linked traits: Genes on the X chromosome
No one affected, female carriers
A= normal; a= colorblind
colorblindnormal
similar to Fig 2.27
Sex-linked traits: Genes on the X chromosome
50% of males affected, 0 % females affected
A= normal; a= colorblind
normalnormal
similar to Fig 2.27
Sex-linked traits: Genes on the X chromosome
50% males affected, 50% females affected
A= normal; a= colorblind
colorblindnormal
similar to Fig 2.27
Sex-linked traits: Genes on the X chromosome
No one affected, female carriers
50% of males affected, 0 % female affected
50% males affected, 50% females affected
A= normal ; a= colorblind
similar to Fig 2.27