Which one of the following can help in the diagnosis of a genetical disorder?
ELISA
ABO blood group
PCR
NMR
C.
PCR
PCR is a technique in which a small fragment of DNA is rapidly cloned or duplicated to produce multiple DNA copies. Thus, it helps in the diagnosis of a genetical disorder. This technique was conceived by American biochemist Kary B. Mullis.
A person who is trisomic for twenty first pair of chromosome suffers from
Klinefelter's syndrome
Down's syndrome
Turner's syndrome
None of the above
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%
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.