1.
Chromosomes are arranged descendingly in a karyotype according to
A. 
The number of genes that they carry
B. 
The type of genes that they carry
C. 
D. 
2.
Karyotype of a male human differs from that of the female in the
A. 
Number of sex chromosomes
B. 
C. 
D. 
Number of the autosome pairs
3.
The figure represents the karyotype of a(an) -----------
A. 
B. 
C. 
D. 
4.
If the number of chromosomes in a human skin cells is 23 pairs, so the number of chromosomes in the sperm is
A. 
B. 
C. 
D. 
5.
The greatest number of chromosomes is found in the -------- cells
A. 
B. 
C. 
D. 
6.
The least number of chromosomes is found in the ------ cells
A. 
B. 
C. 
D. 
7.
From the characters of the human sex chromosomes
A. 
They are the pair number 7
B. 
They are the pair number 23
C. 
D. 
8.
The gene is formed of a sequence of
A. 
B. 
C. 
D. 
9.
The two scientists that had reached to the principles of the chromosomal theory are
A. 
B. 
C. 
D. 
10.
The ratio of segregation in the 2nd generation in the complete dominance according to Mendel's 1st law is
A. 
B. 
C. 
D. 
11.
The ratio of the 2nd generation in the law of independent assortment is
A. 
B. 
C. 
D. 
12.
A crossing took place between a plant (BB) and another one (bb) , the result was the production of 150 new plants. so the number of plants which carries the genotype (Bb) was
A. 
B. 
C. 
D. 
13.
A male cat of a genotype (Aa) is crossed to a female one having the same genotype, so the possibility of producing cats with a genotupe (AA) is
A. 
B. 
C. 
D. 
14.
If the genotype of a child is (bb) so the genotype of his parents should be
A. 
B. 
C. 
D. 
15.
The percentage of gametes with a genotype (Ab) produced from Aabb is
A. 
B. 
C. 
D. 
16.
If the percentage of the offspring with a genotype AABB is 25% so the parents are
A. 
B. 
C. 
D. 
17.
If two Pea plants carry purple flowers (Rr) were crossed, so the percentage of appearance of white flowers in the resulted generation is
A. 
B. 
C. 
D. 
18.
When a pure purple flowered Pea plant was crossed with another one of white flowers, so the resulted generation will be
A. 
B. 
C. 
D. 
19.
The genotype GgRR can produce the following gametes
A. 
B. 
C. 
D. 
20.
A pure character is the character which has
A. 
B. 
Two genes on two different pairs of chromosomes
C. 
D. 
21.
A gene is a section of _____ that contains the instructions for making a particular type of _______.
A. 
B. 
C. 
D. 
22.
Which one of the following is an acquired characteristic?
A. 
B. 
C. 
D. 
23.
If you crossed two heterozygous plants, how many of the offspring will also be heterozygous?
A. 
B. 
C. 
D. 
24.
A dihybrid cross (AaBb x AaBb) will result in what offspring ratio?
A. 
B. 
C. 
D. 
25.
A plant that has purple flowers is crossed with one that has white flowers. The offspring were half white and half purple. What were the genotypes of the parents?
A. 
B. 
C. 
D.