Search found 9 matches

by Juanita1
Thu Aug 20, 2009 8:21 pm
Forum: Molecular Biology
Topic: PCR & Agarose gel electrophoresis
Replies: 3
Views: 11154

PCR & Agarose gel electrophoresis

Hi there, I have been trying to determine the genotype of some cell samples using PCR and agaorse gel electrophoresis. On one of the samples, I was supposed to find two bands representing a heterozygote for a particular mutated receptor but I could only see one band representing the wild type homozy...
by Juanita1
Wed Jul 08, 2009 10:15 pm
Forum: Evolution
Topic: mean fitness calculations
Replies: 0
Views: 2832

mean fitness calculations

I have been given a problem where I need to calculate mean fitness. But the only figures I have are of absolute and relative fitness. I have not been given the genotype frequencies so how can I calculate the mean fitness fromjust the absolute and relative fitness values?
by Juanita1
Wed Jul 08, 2009 10:00 pm
Forum: Evolution
Topic: Diversifying selection
Replies: 15
Views: 37948

Re: Diversifying selection

Ok I see what u r saying. But I thought diversity increased variation, is this not true since u say that greatest variation would be where the two extreme phenotypes and the intermediates live but there is no diversification occuring in that population.
by Juanita1
Tue Jul 07, 2009 11:01 pm
Forum: Evolution
Topic: Diversifying selection
Replies: 15
Views: 37948

Re: Diversifying selection

OK so if there is a population on one side of the island with diversifying selection acting with just big beaks and small beaks, intermediates dieing out while on the other side of the island, there is a population with big beaks, small beaks and intermediates and no diversifiing selection acting. W...
by Juanita1
Tue Jul 07, 2009 11:42 am
Forum: Evolution
Topic: Diversifying selection
Replies: 15
Views: 37948

Re: Diversifying selection

Thabnks for the reply. So are u saying that there is more variation when a population is not diversifying into two sub populations and less when they are on the verge of diversification? I know you said the possibility is still there for variation to occur if their is interbreeding between the two t...
by Juanita1
Mon Jul 06, 2009 9:50 pm
Forum: Evolution
Topic: Diversifying selection
Replies: 15
Views: 37948

Diversifying selection

Hi there I am slightly confused about diversifying selection and its effect on variation. I would have thought that diversifying selection since it leads to diversity would increase variation. However, It also leads to the elimination of intermediate traits thereby reducing variation. So I am unsure...
by Juanita1
Tue Jun 16, 2009 4:37 pm
Forum: Evolution
Topic: Hardy Weinberg eqilibrium-HELP
Replies: 1
Views: 1802

Hardy Weinberg eqilibrium-HELP

In a human population, a mild form of stuttering is caused by an autosomal recessive allele and 1 in 400 people are affected. This condition does not carry a selective disadvantage. How can you find out the proportion of people in the population who are carriers of the stuttering allele but do not s...
by Juanita1
Tue Jun 16, 2009 2:41 pm
Forum: Human Biology
Topic: adipose tissue - urgent help
Replies: 2
Views: 4178

Is there any1 who can help me with adipose tissue?

Hi there,

I posted a message regarding adipose tissue but I notice nobody has answered me. Can someone please have a look and respond, Im really stuck.

Juanita
by Juanita1
Sat Jun 13, 2009 1:47 pm
Forum: Human Biology
Topic: adipose tissue - urgent help
Replies: 2
Views: 4178

adipose tissue - urgent help

I have 3 questions, 1. Can white adipocytes oxidise glucose or is it just brown adipocytes that are capable of oxidising both glucose and fatty acids in large quantities? 2. Which of the statements below are true ways in which the physiology of NST in the BAT of neonatal mammals is different from th...