1992 - JAMB Biology Past Questions and Answers - page 5
41
A child with blood group genotype different from those of both parents and with a mother of genotype OO, can only have a father of genotype
A
A
B
B
C
AB
D
OO
correct option: c
Users' Answers & Comments42
If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are
A
RR, 2Rr, rr
B
2RR, 2rr, 2rr
C
2RR, 2Rr
D
4Rr
correct option: c
Users' Answers & Comments43
A mammal with red fur and long ears was crossed with another having white fur and short ears. If the offspring had a red fur and short ears, the
A
character are linked
B
character are not linked
C
parents are related
D
parents are not related
correct option: a
Users' Answers & Comments44
Pawpaw seeds collected from a tree with many desirable agronomic qualities did not give rise to plants of desirable character as the parent because
A
seeds are not reliable for propagating plants
B
uncontrolled out-crossing can introduced unwanted variability
C
vegetative propagation is best form of reproduction of all crop
D
seeds were not physiologically mature at the harvest
correct option: b
Users' Answers & Comments45
Woman do not suffer from colour blindness because
A
the trait is sex-linked
B
only men are colour blind
C
the genes are recessive and sex-linked
D
the genes occur on both the X and Y chromosomes
correct option: c
Users' Answers & Comments46
The hereditary materials of the cell is
A
the R N A
B
protein
C
the D N A
D
carbohydrate
correct option: c
Users' Answers & Comments47
An example of plant adaptation to a xerophytic environment is represented by the development of
A
fleshy tissue and reduced leaves
B
broad canopy and extensive surface root system
C
thick barks and broad leaves
D
rough leaves and shallow root system
correct option: a
Users' Answers & Comments48
Which of the following factors is LEAST likely to affect the animals living in a fresh water habitat?
A
Turbidity
B
Temperature
C
pH
D
Salinity
correct option: d
Users' Answers & Comments49
The theory of natural selection was developed by
A
Lamarck and Darwin
B
Darwin and Wallace
C
Wallace and Mendel
D
Mendel and Larmack
correct option: b
Users' Answers & Comments50
Fossil records found in sedimentary rocks offer some explanation for the theory of evolution because
A
the deposit have remains of organisms characteristic of when they were formed
B
different strata have remains of organisms of the same kind
C
only organisms with strong parts are fossilized
D
most animal and plant fossils bear little resemblance to present day living specimens
correct option: a
Users' Answers & Comments