A genetics problem involving the probability of genotypes and phenotypes resulting from a cross.

Albinism is an autosomal, recessive condition. A man and a woman who are both carriers for albinism have a child.
What is the probability that…
a) the child is an albino?
b) the child is a carrier of albinism?
c) the child who is not albino is homozygous dominant?
d) their first child is not albino and their second child is?

Recessive epistasis

I've just taken a genetics quiz which I can take over and over until I get above 90%. There's one question I'm having trouble with. I finally got the answer right, but I don't understand why. Here's the question: A locus in Australian Bearded Dragons is involved in the production of pigment. When heterozygous parents mate, 75% of the progeny are colored and the rest are albino. [This tells me that aa = albino.] Another phenotype concerns the specific colors that are expressed such that when two green bearded dragons mate, 2/3 of the progeny are green and the rest are speckled green and purple. The albino dragons cannot express whatever alleles they may have that determine specific colo... click for more

Genetics Exercises: 5 Exercises on Crossings- Autosomal and Sex Linked genes

Complete the gene exercise. Refer to attachment. Exercise I We are going to begin by looking at some basic mating patterns, using a couple of eye color mutations in fruit flies. The normal fruit fly has brick red eyes. This is called the "wild type," because the vast majority of wild fruit flies have this color eyes. One unusual eye color is "brown," which is caused by a mutation in a particular gene. 1. Our first matings will between two homozygous flies, one with brown eyes, the other with the wild type. We'll try both versions of this mating — female wild x male brown, and female brown x male wild. These two crosses are reciprocals of each other. Click on th... click for more

Drosophila melanogaster Genetics

I have male sepia and female apterous flies, I made sure that their where no tracks both male and female tubes. Now I made my first cross using the male sepia and the virgin female apterous fly in three vials. Adults where obtained in all three vials. These are my F1 generation. Now I counted 50 adults of my F1 generation. Than I tally sex and mutation(s) observed. Now I cross F1 with F1, as the adults emerge from the vials I counted a total of 200, sex them, and note mutation(s). These are my F2 generation. The truth is I seem to keep kill them once with ether and once I dropped my vials, plus I just cant seem to sex them right. But I have three questions I need help on. And any other ... click for more

Pipetting and diluting

A solution has a concentration of 3.8mg/ml of protein. a) 7 μl of a 10-5 dilution of the original solution contains how much protein? b) How much should you dilute the original solution to get a protein concentration of 2 μg/ml? If you could also give me a web site or attachment that may help me to under stand other problems like this i would apprecate it. Thank you.