Question

please answer as much of the questions as you can and not only one question:

1. What is the pseudoautosomal region? The region on the Y chromosome where the male-determining gene is found The region on the X chromosome where the female-determining gene is found A region on the Y chromosome where the gene, when mutated, causes androgen insensitivity syndrome A region at which the X and Y chromosomes both have copies of the same genes A region at which the X and Y chromosomes differ in their genes 2. What characteristic is exhibited by an X-linked trait? Only females have the trait. Males inherit X-linked traits from their paternal parent only. Females inherit X-linked traits from their maternal parent only. Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers. Females can inherit a gene for an X-linked trait from either parent. 3. The following pedigree shows the trait of individuals who cannot taste the chemical compound phenylthiocarbamide (PTC). Shaded individuals in the pedigree cannot taste PTC, and this autosomal trait is recessive to the ability to taste the compound. In the pedigree below, if individuals IV-4 and IV-5 married, what phenotype would their children be All children would be tasters. 3 4 3 4 5 6 7 1 2 3 4 5 6 78 9 10 11 5 6 78

1/2 of children would be tasters, 1/2 non-tasters.

	3/4 of the children would be tasters, 1/4 would be non-tasters.
	All the girls would be tasters, all the boys would be non-tasters.

All the boys would be tasters, all the girls would be non-tasters.

Question 4

Griffith's work with Streptococcus bacteria demonstrated that

	DNA is a double helix, made up of four different nucleotide bases.
	The molar amount of A is always equal to the molar amount of T.

	A dead cellular extract is able to provide genetic information.
	The DNA backbone is made up of alternating sugars and phosphates.

Question 5

Which carbon in deoxyribose is NOT a member of the pentose ring?

	1'
	2'

	3'
	4'

5'

Question 6

This person conducted X-ray diffraction studies, which revealed that DNA is a long, helical structure.

	Hershey and Chase
	Franklin

	Chargaff
	Watson and Crick

Levene

Question 7

Restriction enzymes

	Cut DNA at random places.
	Cut DNA at specific locations called recognition sequences.

	Cut DNA and RNA at random places.
	Cut DNA and RNA at specific locations called recognition sequences.

Cut DNA, RNA, and protein at random places.

Question 8

DNA probes are used in southern blotting to determine

	How big the chromosome is in your sample.
	Whether a particular sequence of DNA is present in your sample.

	Whether a particular gene is transcribed into RNA in your sample.
	Whether a particular protein, encoded by your gene of interest, is present in your sample.

Answer 1

1.The correct option is:- a region at which X and Y chromosome both have copies of the same gene.

A pseudoautosomal region is a region that have homologous(similar) sequence of nucleotide on both X and Y chromosome.

2. The correct option is:- females can inherit a gene for X-linked trait from either parent.

A females contain two X chromosome, one from each parent while a male has one X from mother and one Y from father. X linked trait can occur in both males and females as both have the X chromosome. So rest of the options are incorrect.

3. The correct option is:- 1/2 of the children would be tasters, 1/2 non- tasters.

Iv-4 individual is a non taster which is autosmal recessive so his phenotype will be 'aa' and lv- 5 individual is a taster so it can either be AA or Aa but since it's one parent is affected it will be heterozygote having Aa phenotype. Now a cross between them results in 1/2 tasters(Aa) and 1/2 non- tasters (aa).

4. The correct option is:- a dead cellular extract is able to provide genetic information.

Griffith experimented with two strains of streptococcus - smooth(virulent) and rough(non-virulent) to find out which component of cell is capable of providing genetic information.

5. The correct option is:- 5'

The 5' carbon is out of the deoxyribose ring.

6. The correct option is:- Franklin

Rosalind Franklin conducted x ray diffraction studies on DNA which led to the discovery of the double helix structure of DNA by Watson and Crick.

7. The correct option is:- cut DNA and RNA at specific locations called recognition sequences.

Restriction enzymes cut nucleic acids(both RNA and DNA) at specific recognition sequence so they are a type of nucleases.

8. The correct option is:- whether a particular sequence of DNA is present in your sample.

DNA probes is small peice of DNA or RNA that has a sequence which is complementary to the DNA sequence present in the sample. This helps the probe to identify and bind to a particular DNA sequence in the sample.

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