Genetics 4 Online Test

If a fragment of chromosome breaks off and then reattaches to the original chromosome in a reverse direction, the resulting chromosomal abnormality is called a
deletion
Non disjunction
Inversion
Reciprocal translocation
Dihybrid genotypic testcross ratio is
1:1:2
1:1:1:1
3:1
1:1
If a dwarf variety of pea plant was treated with GBA; it grew as tall as the pure tall pea; then phenotypic ratio of F2 is likely to be
all dwarf
all tall
50% tall
75%tall; 25% dwarf
An offspring of two homozygous parents differing from one another by alleles at only one gene locus is
Back cross
Monohybrid
Dihybrid
Trihybrid
If the cell of an organism heterozygous for two pairs of genes represented by Xx, Zz undergoes meiosis; then the possible genotypic combination of gametes will be
XZ; xz; Xz; xZ
XZ; xz; Xz
Xx; Zz; Xz
data incomplete
Hemolytic Jaundice is caused by a dominant gene but only 10% of the people actually develop it. What proportion of the children would be expected to develop the disease if a heterozygous man marries a homozygous normal woman?
1/5
1/10
1/15
1/20
If Mendel had studied the seven traits using a plant with 12 chromosomes instead of 14; in what way his interpretation would have been different?
he could have traced crossing over
he wouldn't have traced independent assortment
he would have discovered blending
he wouldn't have proposed that genes are carried on chromosomes
On basis of Independent assortment and physical basis of inheritance what actually assorts independently?
Sister chromatids
homologous chromosomes
heterologous chromosomes
different genes on same chromosome
An organism with two copies of the same allele is
homozygous for that trait
homologous for the allele
heterozygous for that trait
heterologous for the allele
One of Mendel's pure strains of pea plants had green peas. How many different kinds of eggs could such a plant produce with regard to pea colour ?
1
2
4
8
A sequential expression of a set of human genes occurs when a steroid molecule binds to the
Messenger RNA
DNA sequence
Ribosome
Transfer RNA
/
A B C D s p r q
p q r s
r s q p
r q p s
The offspring of mating between two pure strains are called
Hybrids
Mutants
P generation
F2 generation
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Description:

Genetics is a field of biology that deals in heredity and variation in living things. All living things inherit different traits from their parents . The idea is being used since prehistoric times to improve crops and animals through selective breeding. Modern genetics was set into action with the work of Gregor Mendel from the mid-nineteenth century. The physical basis for heredity as we know now are the units of inheritance called genes.

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Annadas

standard ques i enjoyed it

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DIVYACS

nice qns

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