Punnett square explanation and genetic answers

3.Punnett square for eye color in fruit flies for a cross between a white-eyed female and a red-eyed male. Red eye color is dominant. The eye color gene is carried on the X chromosome. The simulation will show what ratio of their off-spring would be white-eyed and red-eyed, and what ratio of each of these would be male and female. Draw the square and explain the cross.

Decode DNA strand

Working in a research lab, a colleague has identified an mRNA strand that can be translated into a particular protein. Your job is to decode the DNA that would be transcribed to form the mRNA strand in question. Given the mRNA strand below, label the sense and anti-sense strands of the DNA you decode. EXPLAIN the observations and the inferences that help to decide which strand is which. A U G U A U G A G A A U C C C C G G U A A

Dihybrid cross

A plant of genotype AB/ab is testcrossed to ab/ab. If the two loci are 10 m.u. apart, what proportion of the progeny will be AB/ab? Please show and explain exactly how the dihybrid cross was done for this problem.

Mendel Second Genetic Law

Why the proportion 9:3:3:1 in Mendel's Law brakes or is not an absolute true? I need to have a nice and easy example to present to class Is epistasis one of the reasons why the law brakes can you explain to me in easier terms/example how can I present this? Thank you

Usefulness of the test cross

We have to attach all of the sources. I am having trouble finding anything but examples and biology teacher notes. I have worked on this for 2 days and only have an opening statement that seems to pretty much sum up everything. I need to avoid unnecessary information but I feel I have limited resources. Can someone please elaborate of the test cross and its usefulness.