Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
genetics 303, exam1
mendel
| Question | Answer |
|---|---|
| mendel's 1st law | law of equal segregation: separation of d and their reassociation upon fertilization |
| mendel's 2nd law | segregation of alleles of 2 diff genes are indep of 1 another |
| allele | diff form of same gene |
| gene | unit of heredity |
| probability equation | # times an event occurs/total # of events... # of indiv with given phenotype/total # of indiv |
| 3 questions mendel answered | 1. what's inherited? alleles of genes 2. how inherited? according to principles of segregation & indep assortment 3. what's role of chance? known thru Mendel's established probabilities |
| complications studying human traits | 1. most traits aff by 1+ gene & can't b analyzd w/simple mendel genetx 2. many single gene traits that can b followd cause rare diseases, than common phenot 3. genetx is not straight fwd |
| doing probability problems for di & trihybrid crosses | treat as monohybrid crosses. Ex: cross AaBb x AABB (male x female) cross Aa x AA and Bb x BB, ea in own punnett sq |
| how is genetics not straight fwd | -no pure breeding humans -long generatn time -no controlld matings -siblings rarely mate to generate F2 |
| recessive traits | 1.appear in progeny of unaff parents 2. freq show up in consanguineous (really close relations) matings 3. all progeny from 2 aff indiv are aff'd (if both parents have, child has) |
| dominant traits | 1.aff indivs appear in every generation 2. 2 aff parents may have unaff progeny (ex parents may be Rr, Rr...child can be rr) |
| autosomal chromosome | any non-sex chromosome |
| if parents don't have recessive disorder cystic fibrosis, and 1st kid unaff, what's probab 2nd kid will b aff? | w/out aff 1st child, we don't know. unaff child is either RR or Rr, so parents can be RR,Rr or RR,RR or Rr,Rr |
| incomplete dominance | 1.phenot of hybrid may be intermed btw homozyg parents 2.mendel's laws still valid at genotypic level in that phenot still reflective of genot |
| sickle-cell anemia | 1.doesn't decr cell's O2-bindg ability..makes cell prone to early death/cling'g 2.a variant of Hemoglobin HbS results in aggregatn of HbS, causing cells to change shape 3.variant: Glu(hydrophilic) replaced by Val (hydrophobic) |
Created by:
tndbl8
Popular Biology sets