Dosage compensation is the cause of inactivation of X chromosomes in in cats. Th

Question

Dosage compensation is the cause of inactivation of X chromosomes in in cats. This is a good example of: a. X linked genetic mosaics b. Y linked male dominance c. equally dominated by males and females In humans the presence of the Y chromosome results in phenotypic mates due to: a. Two Xs results in phenotypic females b. The production of testis-determining factor (TDF) by the Y chromosome c. The presence of SRY gene d. All of the above If the testicular feminization gene is mutated it results in the loss of the testosterone receptor on all cells. Testosterone plays a huge role in the development of male characteristics. This gene is found on: a. the Y chromsome b. the X chromsome c. all chromsome d. both X and Y chromsomes A particular species of fruit fly has 6X and 8A chromosomes (A = autosomes). this fly is: a. Male b. Female c. Intersex d. Not a fly Staining chromosomes with the chemical ____ and subsequently exposing it to ultraviolet radiation will produce contrasting bands. This is known as R banding. a. Feulgen b. Colchicine c. Giemsa d. Quinacrine ____ is a numerical change in part of the genome, usually a change in the dosage of a single or segment of a chromosome. a. Polyploidy b. Polytene c. Aneuploidy d. Euploidy There is only one viable trisomy genetic disorder, in humans, that results in viable offsprings with the condition of Down Syndrome. This trait affects which chromosome? a Chromosome 3 b chromosome 21 c All chromosomes d No chromosomes, only affects phenotype

Explanation / Answer

7- A) x linked mosaic. X linked mosaicism is the inactivation of one X chromosomes in female and calico cats are ideal example of x linked mosaicism.

B is wrong because dosage compensation doesn't occur in males.

C is wrong because calico Cats are always female and females have XX chromosome while male have XY chromosome, so it is not equally dominanted by male and female.

D is wrong because dosage compensation is not related with Autosomes

8- D all of the above.

All given options are correct.

9- A) Y chromosome.

Testosterone is male hormone and secreted by the gene present on Y chromosome.

X chromosomes can not make testosterone.

10- C) intersex.

Sex determination in flies is determined by ratio of sex chromosome / Autosomes.

If the ratio is 1.5 it is METAFEMALE .

If the ratio is 1 then it is FEMALE.

if the ratio is 0.75 then it is INTERSEX.

if the ratio is 0.5 then it is MALE.

If the ratio is less than 0.5 then it is METAMALE

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