Please explain why females are considered genetic mosaics. Please explain how the calico cat shows female mosaicism.

Why is the Barr body more brightly staining in a cellnucleus than the other chromosomes?

Why are the karyotypes with extra or missing X chromosomes, Turners syndrome, klinefelters syndrrome and triple x, relatively harmless ?

Sketch the chromosome pairing and the different segregation patterns that can arise in an individual heterozygous for a reciprocal translocation.

Show an example of Robertsonian Translocation using letters

What is heterosis? Discuss whether it is caused by a single geneor several genes. Discuss the two major hypotheses proposedto explain heterosis. Which do you think is more likely to becorrect?

Create a chromosome map for each set of three genes from the given information. b) the crossover frequency between gene X and gene Z is 8.5 %, the crossover frequency between gene Y and gene Z is 2.25 % and between gene Y and gene X is 6.25 %

A D. melanogaster male is homozygous for a translocation between chromosomes 2 and 3.  This fly is otherwise wild-type.  This male is crossed to a female fly that is homozygous for normal chromosome order and is homozygous for dumpy wings (dy), a recessive on chromosome 2 and sepia eyes (se), a recessive on  chromosome 3. A male progeny from the above cross is test-crossed to a female fly that is homozygous for dy and se.  What progeny phenotypes and frequencies are expected from this second cross? Answer choices 1/2 wild-type and 1/2 dumpy and sepia 1/4 wild-type, 1/4 dumpy, 1/4 sepia, 1/4 dumpy and sepia All dumpy and sepia                       2/3 wild-type, 1/3 dumpy and sepia 9/16 wild-type, 3/16 dumpy, 3/16 sepia, 1/16 dumpy and sepia

Alloploids are produced by crosses involving two different species. Explain why alloploids may be reproductively isolated from the two original species from which they were derived. Explain why alloploids are usually sterile, whereas allotetraploids (containing a diploid set from each species) are commonly fertile.

The white spots in this image represent Barr Bodies. The cells are from a Male cell line. What is the sex chromosome complement of this cell line?