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WorksheetsGenetics 1
Total questions: 25
Worksheet time: 4hrs 10mins
which law of Mendel is still universal in nature
Law of dominance
Law of independent assortment
Law of segregation
Linkage
In a random mating population frequency of dominant allele is 0.7. What will be the frequency of homozygous dominant phenotype.
0.49
0.09
0.3
0.21
If a couple has four girls, the probability of fifth child being male, is
50
25
75
100
X-linked recessive gene easily express in :-
Male
equal in male and female
Female
not easily express
The mechanism of sex determination in birds shows :-
Male heterogamety
Female heterogamety
Both heterogametic
Both homogametic
Maize has 10 pairs of chromosomes. How many linkage groups are present.
05
10
20
40
An exception to the law of independent assortment is :-
(1) Dominance
(2) Incomplete dominance
(3) Segregation
(4) Linkage
In mother has blood group AB, father has A group then Which of the following blood group will not found in the offspring.
A
B
AB
O
When F1 generation hybrid tall Tt is crossed with dwarf tt parent, it is a case of:-
Dihybrid cross
test cross
Crossing over
Reciprocal cross
Alleles are :-
Alternate forms of a gene
Pair of sex chromosome
homologous chromosome
none of these
If the cell of an organism heterozygous for three pairs of genes represented by AaBbCc, and aabbCcDdEeFF undergoes meiosis then possible type of gametes will be :-
4, 8
2, 12
8, 8
8, 12
What is the basis of pleiotropy?
A spontaneous mutation during the replication of DNA.
Interrelationship between various metabolic pathways in the body.
Chromosomal aberration as chromosomes are the vehicles of genes.
the behaviour of chromosomes during meiosis or gamete formation.
What is incorrect for Hemophilia?
In this disease, a single protein that is a part of the cascade of proteins involved in the clotting of blood is affected
In an affected individual a simple cut will result in non-stop bleeding.
The heterozygous female (carrier) for haemophilia may transmit the disease to sons.
The possibility of a female becoming a haemophilic is extremely rare because mother of such a female has to be hemophilic and the father should be a carrier.
Which of the following are correct regarding linked genes?
I. are located near each other on the same chromosome.
II. violate the law of independent assortment
III. segregate together during meiosis
Only I and II
Only I and III
Only II and III
I, II, III
Aneuploidy results from
Point mutations
Gross structural changes in chromosomes
Failure of cytokinesis after telophase stage of cell division
Failure of segregation of chromatids during cell division
Which of the following is not a feature of Down's Syndrome?1. 2. 3. 4.
It is caused by a non-disjunction in an autosome
The affected individual has trisomy of chromosome 21
The affected individual has a characteristic simian palmar crease
The mental development of affected individual is normal
What is the mode of inheritance of phenylketonuria?1. 2. .4.
Autosomal recessive
Autosomal dominant
Sex linked recessive
Sex linked dominant
Sickle cell anemia results from
A chromosomal aberration
Non disjunction of autosome
A point mutation
Blood transfusion reaction
When Morgan hybridized yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F₁ progeny, the F₂ ratio deviated very significantly from the 9:3:3:1 ratio, this can be attributed to the fact that:
The genes are located on X and Y chromosomes
Fruit fly has abnormal chromosomes
The genes are located on the X chromosome
The genes exhibit incomplete dominance
What can be the possible blood groups of progeny whose father and mother are of A and B group respectively?
A and B only
AB only
All except O
A, B, AB and O
Round seed trait (R) is dominant over wrinkled (r) seed trait in Pea. Heterozygous round seeded plant (Rr) is crossed with wrinkled seed plant (rr). What is the possible progeny?1.2. 3. 4.
302 round: 102 wrinkled
210 round: 95 wrinkled
103 round: 99 wrinkled
103 round: 315 wrinkled
A dihybrid cross produces the following progeny - AaBb = 240; Aabb =754; aaBb = 746; aabb = 260. What is the distance between the two genes on the chromosome?
12.5 map units
1 map unit
20 map units
25 map units
Male pattern baldness is a ------- trait
sex-linked
sex-limited
sex-influenced
Y-linked
The ultimate source of allelic variation is:
Recombination
Natural selection
Mutation
Drift
A colour blind girl is rare because she will be born only when
Her mother and maternal grand father were colour blind
Her father and maternal grand father were colour blind
Her mother is colour blind and father has normal vision
Parents have normal vision but grand parents were colour blind.
