science test 2 Flashcards
Where is genetic information contained?
Genetic information is contained in DNA in the nucleus of the cell
How is the human body organized genetically from large to small?
Cells, chromosomes, DNA (large to small)
What can provide information on human genetics?
Pedigree, human DNA fingerprint, breeding of animals/plants (Punnett Square)
What is the 50/50 Rule?
Each parent contributes 50% or ½ of the chromosomes to new baby. Recessive traits MUST come from BOTH parents
How can DNA fingerprinting be used?
ID a person (dead or alive), ID at person at a crime scene, diagnose a genetic disease Discover heritage or who you are related to
What does a pedigree look like with a recessive trait? A dominant trait?
Recessive (diabetes)–F1 generation has dominant trait and recessive trait–disappears
F2 generation–Recessive trait comes back
Dominant (Marfan’s Syndrome, Polydactyly)–Show itself in F1 and F2 generations only way to get rid of it is to match recessive traits
Look at Lesson 66 Page D-56
Know ABO and +/- blood typing
ABO blood typing is co-dominant
+/- is regular dominant/recessive
A and B are co-dominant
O is recessive
Rh+ is dominant
Rh- is recessiveBlood Type A–AA/AO
Blood Type B–BB/BO
Blood Type AB–AB
Blood Type O–OO
RH factor + – ++/+-
RH factor negative - –
Can someone be blood type O from Dad being Blood Type A and Mom being Blood Type B?
Yes–Both Mom and Dad carry recessive traits
Dad–AO
Mom–BO
Kid is OO
Can a kid be Blood Type AB+ if Mom is Blood type AB- and Dad is blood type BO-?
Mom–AB-
Dad-BO-
NO–Even though it is possible to get a kid that is AB blood type, Mom and Dad are Rh- and can not make kid AB+
Can someone be Rh- when both parents are Rh+?
YES–Both Mom and Dad carry recessive traits
Dad is +-
Mom is +-
Kid is –
Recognize Dominant or Recessive disease pedigrees and explain why?
Look at examples in Lesson 66 (Page D-56)
Royalty- sex linked recessive
Critter tail- recessive
PKU- recessive
Polydactyly- Dominant
ABO blood type- Codominant
