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WALTER BSC1010 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS 100% VERIFIED LATEST UPDATE
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WALTER BSC1010 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS 100% VERIFIED LATEST UPDATE T.H Morgan Used drosophila melanagaster (fruit flies) 3 pairs of autosomes pair of sex chromosomes XX=female XY=male Fruit flies wildtype- red eyes mutant phenotype- white eyes Male/female syst...

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  • September 22, 2024
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WALTER BSC1010 EXAM QUESTIONS AND ANSWERS WITH

COMPLETE SOLUTIONS 100% VERIFIED LATEST UPDATE



T.H Morgan


Used drosophila melanagaster (fruit flies)

3 pairs of autosomes

pair of sex chromosomes

XX=female

XY=male


Fruit flies


wildtype- red eyes

mutant phenotype- white eyes


Male/female systems


XX(female), XY(male)

XO(female), X(mlae)

ZW(female), ZZ(male)

Diploid(female), haploid(male)


Sex-linked genes


genes found on the sex chromosomes

ex. color blindness- recessive, found on X chromosome

,Hemizygous


the single set of genes that males acquire from their mother's X chromosome


Concentration dependency


Enzyme A= [x]

program genes how much to make


Barr body


inactive x chromosome, on the nuclear envelope.


Mosaic


A pattern of development in which an organism consists of two sets of cells that differ according to

which X chromosome is inactivated.


X-IST


X-inactive specific transcript

only active gene on Barr body DNA methionine (-CH3)


Linked genes


genes located on the same chromosome that tend to be inherited together in genetic crosses


Body colour, wing size(fruit flies)


normal-gray bodies, normal (b+,Vg+)

mutant- black bodies, vestigial (b,Vg)

recessive, not sex linked

test cross~5:1:1:5

, The closer two things are, the _____ of a chance of them being crossed over


less


Monosomic


2N-1

A chromosomal condition in which a particular cell has only one copy of a chromosome, instead of the

normal two; the cell is said to be monosomic for that chromosome.


Non-disjunction


meiosis in which there is a failure of paired homologous chromosomes to separate


Trisomic


2N+1

A chromosomal condition in which a particular cell has an extra copy of one chromosome, instead of the

normal two; the cell is said to be trisomic for that chromosome.


Aneuploidy


an abnormality involving a chromosome number that is not an exact multiple of the haploid number

(one chromosome set is incomplete)


Polyploidy


condition in which an organism has extra sets of chromosomes

ex. 3N, 4N


Deletion


the loss of a part of DNA from a chromosome

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