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
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
