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Biology
UTME / JAMB 2003
Variation & Genetics (Heredity)
Solution
A man and his wife are both heterozyous for the sickle-cell trait. The likely percentage of their offspring that will be either carriers or sicklers is
A
75%
B
50%
C
25%
D
100%
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
An heterozygote for sickle-cell anaemia = AS
Crossing two AS persons, we have one AA, two AS and one SS.
\(\therefore\) The probability that the children are either carriers or sicklers = \(\frac{3}{4}\)
= 75%
Source: Myschool Past Questions Archive (Record #7278)
Biology
UTME / JAMB 2003
Variation & Genetics (Heredity)
If the pair of alleles for baldness is given as Bb, a female carrier will be denoted by
A
XbYB
B
XBXB
C
XBY
D
XBbXb
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #7282)
Biology
UTME / JAMB 2003
Variation & Genetics (Heredity)
Solution
An organism that has been extensively used to test the chromosomes theory of heredity is
A
Drosophila melanogaster
B
Muscar domestica
C
Zea mays
D
Homo sapiens
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Drosophila melanogaster has been extensively used to test the chromosome theory of heredity. It was instrumental in the early development of genetics, with Thomas Hunt Morgan and his team at Columbia University using it to provide strong evidence for the theory. This work led to the formulation of the chromosome theory, which states that genes are located on chromosomes and that inheritance patterns can be explained by the behavior of chromosomes during meiosis.
Drosophila have a short life cycle, allowing for quick observation of multiple generations, crucial for genetic analysis. They produce many offspring, making it easier to observe patterns of inheritance. They can be easily bred and maintained in a laboratory setting.
Drosophila also possess polytene chromosomes, which are large and visible under a microscope, facilitating the mapping of genes. They readily develop mutations, allowing researchers to study the effects of altered genes.
Source: Myschool Past Questions Archive (Record #7450)
Biology
UTME / JAMB 2003
Variation & Genetics (Heredity)
A feature associated with the Y-chromosome in human is
A
long eyelashes
B
prominent fingernails
C
facial hairs
D
enlarged breast
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #7451)
Biology
UTME / JAMB 2003
Reproduction in Plants & Animals
The type of reproduction that leads to variation animal and plant population is
A
budding
B
sexual
C
vegetative
D
asexual
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #7452)
Biology
UTME / JAMB 2003
Variety of Organisms & Classification of Living Things
An insect with a mandibulate mouth part will obtain its food by
A
biting and chewing
B
chewing and sucking
C
chewing
D
sucking
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #7453)
Biology
UTME / JAMB 2003
Adaptation & Evolution
An argument against Lamarck's theory of evolution is that
A
disuse of body part cannot weaken the part
B
disused part is dropped off in the offspring
C
acquired traits cannot be passed on to the offspring
D
trait cannot be acquired through constant use of body parts
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #7454)
Biology
UTME / JAMB 2003
Respiration & Gaseous Exchange
The presence of sunken stomata and the folding of leaves are adaptations to
A
Prevent entry of pathogens
B
Reduce water loss
C
Remove excess water
D
Prevent guttation
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #7455)
Biology
UTME / JAMB 2003
Adaptation & Evolution
Spines and shells on animals are adaptation for
A
camouglage
B
chemical defence
C
physical defence
D
mimicry
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #7456)
Biology
UTME / JAMB 2003
Adaptation & Evolution
An example of cryptic colouration is the
A
Mottled colours on the moths that rest in lichens
B
bright colour of an insect pollinated flower
C
Green colour of a plant
D
Bright marks on poisonous tropical frog on veriegated leaves
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #7457)
Biology
UTME / JAMB 2003
Adaptation & Evolution
Which of the following requires the use of carbon dating to prove that evolution has occurred?
A
Comparative anatomy
B
Biochemical similarities
C
molecular records
D
Fossil records
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #7458)
Biology
UTME / JAMB 2003
Adaptation & Evolution
the inactive state exhibited by an animal during hot dry seasons is termed
A
Aestivation
B
Dormancy
C
Resting
D
Hibernation
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #7459)
Biology
WAEC / WASSCE 2003
Variety of Organisms & Classification of Living Things
Which of the following is not correct about human cell?
A
The basic unit of living thing is the human cell
B
All living organisms are either single or group of cell(s)
C
All the cells in organism are the same
D
There is no life apart from the in cell
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #20445)
Biology
WAEC / WASSCE 2003
Excretion & Homeostasis
Which organ removes the largest the largest quantity of water from the blood?
A
lung
B
intestine
C
kidney
D
skin
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #35502)
Biology
WAEC / WASSCE 2003
Transport System in Plants & Animals
In cold condition the mammalian body reacts in the following ways except
A
shivering of the body
B
dilation of the capillaries supplying blood to the skin
C
constriction of blood capillaries in the skin
D
increased rate of chaemical changes in the body
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #35505)