Punnett square Above TEST THURSDAY!
Important Vocabulary:
Punnett square- A square used to find the probabilities of genotypes for one person.
Genotype- The makeup of two alleles. (BB, or Bb)
Phenotype- The observable trait of an organism
Homo- Same
Hetero- Different
Heterozygous genotype- Different alleles (Bb)
Homozygous genotype- Same alleles(BB, bb)
First off, we went over Monday's homework that included Punnett squares.
Then, we talked about dominant and recessive genes using Punnett squares. If Corinna cannot curl her tongue, she must have two lowercase or recessive genes (i,i). Her parents would then have two have one dominant and one recessive gene for tongue curling to have a baby that cannot curl their tongue. (I,i)
REMEMBER: A Punnett square is the probability for ONE person.
The upper case letter is ALWAYS the dominant gene.
Use the same letter when talking about the same trait.
Adding dominant or recessive to the end of homozygous (ex. homozygous recessive) will mean the pair is either all recessive or all dominant.
Links:
Yesterday's homework: http://www.npsd.k12.nj.us/20222069133223760/assignments/browse.asp?C=59836&A=400&DomainID=2556&AssignmentID=3247&AssignmentCategoryID=0&Month=0&Year=0
Claudia's EtherPad: http://ietherpad.com/o0OLrTHAiO
Tim Sienko
(5th Round)
Nice blog! Just wondering, if you have 2 recessive genes or two genes that say you can't curl your tongue (bb) will you ever be able to pass down a gene where you can curl your tongue?
ReplyDelete-Sara :)
No , you can only pass recessive genes(b) to your children sicne you didn't inherit a dominant gene for that trait.
ReplyDeletebut wait-some of the traits-like curling your tongue can skip a generation. Right? So if both of ur parents cant curl your tongue doesnt mean you wont be able to. You might have a chance of curling your tongue if your grandparents can. Just because your parents dont have a trait doesnt immeditatly mean that you wont have it. You just need to investigate and see if your grandparents or blood-related relative have that trait. correct me if im wrong.
ReplyDeleteClaudia <3