Detailed explaining test-crosses - the usefulness, purpose and how it is performed

Explain the test - cross. I have to explain the usefullness of the test-cross. I had my paper written then was told I need to incorporate the Punnett square, monohybrid cross, dihybrid cross etc. into the paper. I am now confused - maybe I have just researched so much I cannot make sense of any of it. How is the Punnett Squa ...continues

genes

Highly expressed genes have a much greater tendency to lose introns (in evolutionary time scale) than genes expressed at very low levels. What molecular mechanism explains this difference?

Down syndrome

Down syndrome occurs once in approximately 700 live births. The vast majority of these cases are due to trisomy 21 resulting from a non-disjunction event. In rare cases, Down syndrome is caused by a reciprocal translocation between chromosome 21 and the tip of chromosome 14 (or some other autosome) in the germ line. No genes ...continues

Understanding how inheritance and genetics is involved in evolution?

How is the genetic and inheritance prosess related in evolution?

eukaryotic DNA

Is eukaryotic DNA packaged in the cell in the form of a double helix

Genetic diversity

What is one way that genetic diversity can be introduced in mitosis?

Mating among offspring

Why is mating between related people result in genetic disorders.

Genetic Cross

In pigs, there are two loci which can influence skin color, genes A and B. Color ranges from roan (red) to sandy to white. Roan pigs have at least one dominant allele at both loci, sandy pigs have at least one dominant at either (but not both) loci, and white pigs have no dominant alleles. a) Researchers mate a red pig (AABB) ...continues

Hybridization

Given a plant species A with a diploid number of 10 and a plant species B with a diploid number 0f 18, describe how new polyploid species C could arise in a single generation from hybridization between A and B. Be sure to describe the process (including cell division events) and tell what the probable diploid number of C would b ...continues

Genetic Cross

a) Cross a wildtype female with a yellow bodied male to produce an f1 offspring generation. Which allele is domonant and which is recessive. Justify your responce using your results. b) Now mate F1 individuals to produce an F2 generation. report the results and explain them. Is there evidence of sex linkage. justify your respon ...continues