Search found 34 matches

by DRT23
Wed Apr 06, 2011 10:34 am
Forum: Genetics
Topic: Reduced penetrance vs. multifactorial?
Replies: 1
Views: 3900

Penetrance is used as a statistical tool to determine the risk of getting ill when you have a particular well-known mutation. So, I don't think it's vital to distinguish if a disorder has reduced penetrance or multifactorial trait. Of course, this information would be helpful to combat with disorder...
by DRT23
Wed Apr 06, 2011 10:13 am
Forum: Genetics
Topic: Mendel's Peas
Replies: 4
Views: 5662

Re: Mendel's Peas

Procrastinate wrote:
DRT23 wrote:1) a. character = gene and trait = allele
/quote]

So if I had a heterozygous dominant set of alleles, then would that mean I would have one trait or two traits?


You would have 2 traits in genotype and 1 character (dominant one) in phenotype.
by DRT23
Sun Apr 03, 2011 3:21 pm
Forum: Genetics
Topic: Mendel's Peas
Replies: 4
Views: 5662

Re: Mendel's Peas

1) a. character = gene and trait = allele

2) b. significant finding wasn't 'considerable genetic variation' because he found mathematical reasioning behind inheritence. Besides, considerable variation is visible on phenotype and you don't need to find out what goes behind the scene :)
by DRT23
Wed Mar 30, 2011 9:57 am
Forum: Genetics
Topic: HELP with monohybrid crossing. Grade 10
Replies: 2
Views: 2629

This is why geneticists use models like beans or Drosophila that have very high number of offspring at one time and replicate their experiements for many times. Your answer seems correct. For an expected ratio of green 2:2 blue after crossing on notebook (I mean theoritically), you would expect 2 gr...
by DRT23
Wed Mar 30, 2011 9:33 am
Forum: Genetics
Topic: Dihybrid cross involving two sex-linked genes
Replies: 6
Views: 15177

Re: Dihybrid cross involving two sex-linked genes

:D Thanks! This means that we cannot predict percentages according to Mendel's law, even if we know the exact genotypes. A Punnett square can give possible combinations of gametes, but Mendel' s law does not apply since the genes reside on the same chromosome. So why use a Punnet square? So why use...
by DRT23
Wed Mar 30, 2011 9:09 am
Forum: Genetics
Topic: Plz help - question on probabilty of a nucleotide sequence
Replies: 4
Views: 4561

Re: Plz help - question on probabilty of a nucleotide sequence

Yes, I see it now that the calculation is for the sequence given by the question. So, the answer should be 3.

To get AAGCTT I first calculated the probability of that sequence occuring in a row:
This sentence made me ask it. I guess james0222 mistyped it.
by DRT23
Mon Mar 28, 2011 6:31 pm
Forum: Genetics
Topic: Dihybrid cross involving two sex-linked genes
Replies: 6
Views: 15177

Since they're both on the same chromosome, Mendel's second law (the law of independent assortment) doesn't apply in this case. But, Punnett square may be used in some situations like in a and can't be used in others like b: a) If a man has both hemophilia and daltonism > X^hd Y, no other possibility...
by DRT23
Mon Mar 28, 2011 6:07 pm
Forum: Genetics
Topic: Plz help - question on probabilty of a nucleotide sequence
Replies: 4
Views: 4561

Re: Plz help - question on probabilty of a nucleotide sequence

To get AAGCTT I first calculated the probability of that sequence occuring in a row: (.31)(.31)(.19)(.19)(.31)(.31) = 0.0003339 But I think with this formula, the order doesn't matter, rigth? So, permutation of a sequence which has 6 elements with two repetitions (As and Ts): 6!/(2!).(2!)=180 Which...
by DRT23
Sun Mar 20, 2011 9:55 am
Forum: Genetics
Topic: how does RNA and DNA *move*?
Replies: 3
Views: 7494

Nice research, interesting findings... Thank you for posting this summary, placebo.
by DRT23
Sat Mar 19, 2011 10:44 am
Forum: Genetics
Topic: parental definitions of chromosomes in heterozygous animals
Replies: 1
Views: 1378

I guess there is not an easy way of doing that unless you have more than one characther both of which are inherited in genes that are on the same chromosomes. See m Or, if the given gene is an imprinted gene, its expression depends on its parantel origin. For example, Angelman syndrom/Prader-Willi s...
by DRT23
Sat Mar 19, 2011 10:27 am
Forum: Genetics
Topic: 2 Questions about Evolution and Genetics
Replies: 3
Views: 2900

Thank you, canalon! Now, I see what the author wants to mean in these sentences.
by DRT23
Wed Mar 16, 2011 9:37 am
Forum: Genetics
Topic: stages in the cell cycle
Replies: 1
Views: 4881

Re: stages in the cell cycle

Hello, G2 b. Chromosomes are visible. Chromatides are condensed in prophase sub-stage of M (mitosis) phase of cell cycle. Thus, chromosomes are visible in M. _________ e. Cells usually leave this stage(s) when they become cancer cells. The answer is G0. Because, cancer cells divide like normal cells...