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WorksheetsGenetics - 1 - sec 1
Total questions: 25
Worksheet time: 4mins
All the following is an evidence that the chromosomes carry the genetic information in human, except that ...........
their number is constant after fertilization.
their number in each somatic cell is 46
their number in each sex cell is 23
their number is identical in all the cell types.
All the following are from the characters of human sex chromosomes pair in a female,except that .............
it is arranged at the end of chromosomes.
it carries number (23).
it is asymmetric.
it follows the chromosomes pair no. (7) in size.
If the genotype of a son is (aa), the genotypes of the parents are .........
(AA) x (aa).
(AA) x (Aa).
(AA) x (AA).
(Aa) × (aa).
When crossing two pea plants, one of them has hybrid smooth seeds and the other has
wrinkled seeds. So, the percentage of smooth seeds in the resulted generation is .........
0%
100%
75%
50%
A person with genotype (GgHH), which of the following is correct regarding the produced gametes ?..........
75% (GH).
25% (gH)
50% (gH).
100% (GH).
The percentage of gamete (AB) for the genotype (AABb) represents about.........
50%
25%
100%
75%
If you know that the long wings gene is dominant over the short wings gene in Drosophila insect, when crossing ocurrs between a long-winged male and a short-
winged female, all the resulted individuals were long-winged. Based on that, the percentage of short-winged individuals in the resulted offspring from crossing male and female from the first generation is ..........
75%
25%
50%
100%
If you know that the number of chromosomes in a human skin cell equals (X). So, the number of autosomes in stomach cell equals..........
х -2
X
х -1
2 X
When crossing two chickens one of them is black-feathered and the other is white-feathered,
the members of the first generation will be ............... according to lack of dominance.
50% black : 50% white
100% black
100% gray
mixture of gray,white and black
The individual's blood group is normally determined by............
the inheritance of 1 from the 3 possible alleles (A, B or O) from each parent.
all the previous.
the genetic inheritance and environmental influences during life.
the environmental influences only.
Human blood groups are identified by...........
microscopic examination of white blood cells.
a series of enzymatic controlled reactions.
antigen-antibody reactions.
clotting factors in the plasma.
A person whose blood group is (O+) his/her red blood cells have........... antigen(s) on their surface.
Rh and B
Rh
Rh, A and B
Rh and A
The person whose red blood cells contain three types of antigens, his/her phenotype is...........
(ABRh+)
(ORh-)
(ABRh+)
(ORh+)
If the mother is (Rh- Rh-) and the father is (Rh+Rh-), and the mother wasn't injected with a protective serum after the delivery of a baby with (Rh-), the probability of the 2nd
baby death is...........
25%
50%
75%
0%
When crossing a white-flowered pea plant with a pink-flowered one, there were 3/8 of the offspring are pink-flowered and 5/8 are white-flowered,
which of the following represent the parents' genotypes ? ................
Aabb x AABb
AAbЬ x AаBb
AAЬЬ x aаBB
Aabb x AaBb
If two pea flower (sweet pea) plants with genotype (AABb) were crossed together, the percentage of appearance of white-coloured flowers in the offspring is.............
75%
0%
25%
50%
The inheritance of chlorophyll absence character in corn plant is considered a case of............
lethal genes.
complementary genes.
lack of dominance
complete dominance.
All the following are from the examples of non-mendelian characters, except the...........
yellow fur colour in mice.
flowers colour in Antirrhinum plant.
flowers colour in green pea plant.
flowers colour in pea flower (sweet pea) plant.
If the lethal gene is dominant, the genotype of individuals that die is...............
(Cc).
(cc).
(CC).
no correct answer.
A man whose blood group is (AB) married to a woman whose blood group is (O). So, the chance of giving a child with blood group (A) is...........
50%
75%
25%
100%
When planting some corn seeds, all the seedlings were white-coloured. The reason for this is, due to all the following, except...........
the seeds genotype is (cc) + light absence.
the seeds genotype is (Cc) + light absence.
the seeds genotype is (cc) + light presence.
the seeds genotype is (Cc) + light presence.
If the chromosomal structure of an individual is (45 + XY), this person is a.............
male who suffers from Down's syndrome.
female who suffers from Down's syndrome.
male who suffers from Klinefelter's syndrome.
female who suffers from Turner's syndrome.
What is the ratio between the number of sex chromosome (X) in the skin cell of a normal male human and the same cell in the female respectively ?............
2:2
2:1
1:1
1:2
Which of the following cells contains the least number of chromosomes ?...........
A kidney cell of a female with Turner's syndrome.
A skin cell of a male with Klinefelter's syndrome.
A liver cell of a normal male.
A muscle cell from intestine of a female with Down's syndrome.
If mitotic division, then meiotic division, then fertilization occurred for a cell, the stages that are passed by this cell are.............
n →2n →2n → n
2n → 2n → n → 2n
2n →n → n → 2n
n → n →2n →2n
