Search found 5 matches

Thu Feb 12, 2009 4:45 pm
Forum: Genetics
Topic: Urgent homework help needed - DNA extraction practical
Replies: 4
Views: 15017

Re: Urgent homework help needed - DNA extraction practical

1) What is the function of salt in this experiment? - my teacher said it had something to do with enzymes being Ph sensitive, but I'm not sure how that relates to this practical The enzyme performs best in a particular pH, so you make a buffer to utilize the enzyme's maximum potential. 2) What is t...
Thu Feb 12, 2009 3:34 pm
Forum: Genetics
Topic: Mendelian Genetics
Replies: 4
Views: 4520

Re:

miloshic wrote:Tt x Tt
and you get TT Tt Tt tt
1. 3/4*1/2=3/8
2. 1/4*1/2=1/8
3. 3/4*1/2=3/8
I think I did this well

You only got one of the answers correct.
Thu Feb 12, 2009 8:14 am
Forum: Genetics
Topic: Mendelian Genetics
Replies: 4
Views: 4520

Re: Mendelian Genetics

The ability to taste the chemical PTC is an autosomal dominant phenotype, and the inability to taste is recessive. If a taster woman with a non taster father marries a taster man, who is a previous marriage had a nontaster daughter, what is the probability that their first child will be i) a non ta...
Thu Feb 12, 2009 7:59 am
Forum: Genetics
Topic: Confused with punnet squares - me and teacher
Replies: 4
Views: 5880

Re: Confused with punnet squares - me and teacher

so how do you work out the genotype and phenotype ratios? First bit of advice: switch seasaba's format if you want males on top and females on bottom. As for genotype and phenotype ratios, let me demonstrate with a 2x2 punnet square: T = Tall (dominant) t = short Both male and female are Tt ___ T |...
Thu Feb 12, 2009 7:46 am
Forum: Genetics
Topic: homework help!!!
Replies: 2
Views: 1986

Re: homework help!!!

Hardy-Weinberg Equilibrium: P^2 + 2pq + q^2 = 1; p + q = 1 Frequency of those who can taste PTC: 70% = 0.7 Frequency of those who can't taste PTC: 30% = 0.3 T = p t = q tt = 0.3 = p^2 p = 0.3^(1/2) q = 1 - p This was derived from p + q = 1 Frequency of those with a "T" = q Frequency of th...