1.
In Drosophila, XRXr is a ......
A. 
B. 
C. 
D. 
2.
The number of sex chromosomes in the normal human sperm is .......
A. 
B. 
C. 
D. 
3.
The number of autosomes in the human ovum is ........
A. 
B. 
C. 
D. 
4.
The chromosomal structure of the ovum in human is .......
A. 
B. 
C. 
D. 
5.
Chromosome X differs from that of Y in .......
A. 
B. 
C. 
Number of genes it carries
D. 
6.
The formation of the two testes in the fetus begins after about ............ weeks from fertilization
A. 
B. 
C. 
D. 
7.
A turner female has a chromosomal structure of .........
A. 
B. 
C. 
D. 
8.
A male with a Down's syndrome results from the fertilization of a normal ovum by a sperm of ........
A. 
B. 
C. 
D. 
9.
The figure represents a karyotype of .........
A. 
B. 
C. 
D. 
10.
Klinefelter's syndrome results due to the fertilization of an abnormal ovum having two X chromosomes by a sperm of ..........
A. 
B. 
C. 
D. 
11.
The person having (45 + XY) is a ........
A. 
Female with Down's syndrome
B. 
Female with Turner's syndrome
C. 
Male with a Down's syndrome
D. 
Male with Klinefelter's syndrome
12.
.......... is an example of sex linked traits.
A. 
Colour of feathers in Andalusian Fowls
B. 
C. 
D. 
Eyes colour in Drosophila
13.
If a healthy man marries a colour-blinded woman, the disease will appear in .......... of their offspring.
A. 
B. 
C. 
D. 
14.
A female suffers from a genetic hair falling, has a chromosomal structure of .......... (if B+ is the gene for hair falling).
A. 
B. 
C. 
D. 
15.
When a healthy man marries a haemophylic carrier woman, the possibility of producing females with haemophilia disease is ........... %
A. 
B. 
C. 
D. 
16.
The genes of early baldness in man are carried on ...........
A. 
B. 
C. 
D. 
17.
From the examples of sex linked traits we have .........
A. 
B. 
C. 
D. 
Eye colour in human beings
18.
From the examples of sex-influenced traits in human, we have .........
A. 
B. 
C. 
D. 
19.
From the examples of sex-limited traits, we have
A. 
B. 
C. 
D. 
20.
The ability of a female bird to lay eggs is a ...........
A. 
B. 
C. 
D. 
21.
Red-green color blindness is X-linked in humans. If a male is red-green color blind, and each of his parents have normal color vision, which of the male's grandparents is most likely to be red-green color blind?
A. 
B. 
C. 
D. 
22.
A couple has a female child with Tay Sachs disease, and three unaffected children. Neither parent nor any of the four biological grandparents of the affected child has had this disease.
Tay Sachs disease is a genetic lethal disease that leads to death usually in early childhood.
The most likely genetic explanation is that Tay Sachs disease is inherited as a/an ______________ disease.
A. 
B. 
C. 
D. 
23.
Which of the following is not among the aims of the human genome project?
A. 
Gene therapy for normalizing blood glucose levels
B. 
Genetic testing for hemophilia
C. 
Genetic testing for typhoid disease
D. 
Evolutionary relationship
24.
Alternation of the nucleotide sequence of a gene causes a change ------
A. 
In the karyotype of somatic cells
B. 
C. 
In the structure of the chromosome
D. 
In the function of the protein formed by that gene
25.
A. 
B. 
C. 
D. 
Female carrier for colour-blindness.