Multiple Choice QuestionsWhich one of the following can help in the diagnosis of a genetical disorder?
ELISA
ABO blood group
PCR
NMR
The children of a haemophilic man and a normal woman are
all haemophilic
only daughters are haemophilic
only sons are haemophilic
neither sons nor daughters are haemophilic
If a plant having yellow or round seeds was crossed with another plant having green and wrinkled seeds then F, progeny are in the ratio
15 : 1
1 : 15
1 : 13
all yellow and round seeds
A man of blood group 'A', marries a woman of blood group 'B', both of them are heterozygous for blood group, chances of their first child having blood group AB will be
25%
50%
75%
100%
2n - 1 condition is called
trisomy
monosomy
nullisomy
tetrasomy
B.
monosomy
2n - 1 condition represents diploid set of chromosomes having loss of one chromosome, the presence of one unpaired chromosomes along with diploid set is called monosomy.
Trisomy is a chromosomal disorder characterized by an additional chromosome. Eg. Down syndrome.
Nullisomy is a genetic condition involving the lack of both the normal chromosomal pairs for a species. This condition is represented by 2n - 2.
Tetrasomy is a form of aneuploidy with the presence of four copies, instead of normal two, of particular chromosomes.
When paternal and maternal chromosomes change their materials with each other in cell division this event is called
synapsis
crossing over
bivalent forming
dyad- forming
Which of the following conditions represents a case of codominant genes
A gene expresses itself, suppressing the phenotypic effect of its alleles.
Genes that are similar in phenotypic effect when present separately, but when together interact to produce a different trait.
Alleles, both of which interact to produce a trait, which may or may not resemble either of the parental types.
Alleles, each of which produces an independent effect in a heterozygous condition.
Assertion: XX-XY type of sex determination mechanism is an example of female heterogamety and is found in Drosophila.
Reason: Male heterogamety is seen in moths where males produce two different types of gamete.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
25%
100%
No chance
50%
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