Homework-Lecture 1

•The pair of chromosomes that differ in the male from the female is the pair of chromosomes number………

1
22
8
23

•the opposite figure shows a pair of chromosomes in a stomach cell for a certain person, study it, then answer the following :

•The taller chromosome is likely to be found in the somatic cells for this person with ……….

25%
50%
75%
100%

•the opposite figure shows a pair of chromosomes in a stomach cell for a certain person, study it, then answer the following :

•The shorter chromosome is present in ………

all the male somatic cells.
all the male gametes.
all the somatic cells and gametes in males.
all the somatic cells and gametes in females.

•Chromosomal patterns can be studied to determine…………

Sex
Chromosomal mutations
Examination of dead fetuses to determine if he had suffered from a chromosomal problem that led to his death
All of the above

The two opposite figures (A) and (B) represent a blood sample and a sample of seminal fluid for a person respectively, which of the following expresses the total number of chromosomes in both samples ?

92
276
414
506

•The diploid cells divide mitotically to give ………… cells

haploid
diploid
tetraploid
(A) and (b)

•The sperms in human differ from each other in

the number of somatic and sex chromosomes together.
The number of sex chromosomes only.
The type of sex chromosome.
the size of somatic chromosomes.

•The sperm in human contains all the following, except ……….

The tall or short sex chromosome.
half the number of chromosomes found in the somatic cell.
22 autosomes.
the pair of sex chromosomes.

•The pair of chromosomes that represents the smallest size in the human karyotype is the pair no. ………..

1
7
22
23

•If the sequence of nucleotides in DNA molecule which expresses a certain gene is changed, all the following will happen, except that …..

the type of the resulting protein will change.
the expressed character will change.
the code of the gene will change.
all the genetic characters will change.

•The structure that its cells divide mitotically only is …….

Human female ovary
dead flower
Human male skin
B and c

•If the number of chromosomes in a human skin cell is (23) pairs, the number of autosomes in the sperm is ……….

22
23
22 pairs
23 pairs

•in the karyotype of a human female, the pair no. (23) of chromosomes is larger in size than the pair no. …………. of chromosomes.

5
6
7
8

•The opposite figure illustrates the karyotype of a cell of a living organism that resembles the human in sex determination, what does this karyotype represent ?

Somatic cell in a male.
Somatic cell in a female.
Gamete in a male.
Gamete in a female.

•The pair of sex chromosomes in the human female is characterized By all the following, except that…….

it follows the chromosomes pair no. (7) in size.
it is arranged at the end of chromosomes.
It carries the number (23)
It is asymmetric

•The arrangement of genetic material in human cells is in the form of ………….., which are found inside the…………….respectively

Genes and nucleolus
Chromosomes and nucleus
Nucleus and genes
Genes and nucleus

the ratio between the number of sex chromosome (X) in each of a boy arm muscle cell and a girl arm muscle cell is ………… respectively.

1 : 2
1 : 1
2 : 1
1 : 3

What is the correct figure representing the human male karyotype?

A
B
C
D

•If you know that the number of chromosomes in the nucleus of a plant stem cell is (42) chromosomes, the number of chromosomes in a pollen grain for that plant equals …………..

21
24
42
84

•The opposite graph represents the number of chromosomes in the body cells for some living organisms, study it, then answer the following :

•The number of autosomes in a male sperm nucleus for organism (C) is

one chromosome.
two chromosomes.
23 chromosomes.
22 chromosomes.

•The opposite graph represents the number of chromosomes in the body cells for some living organisms, study it, then answer the following :

•The number of chromosomes in the nucleus of a cell produced from meiotic division of an ovary cell in organism (A) is ……………. chromosome(s).

8
4
1
2

•The opposite graph represents the number of chromosomes in the body cells for some living organisms, study it, then answer the following :

•The number of chromosomes in the cell nucleus produced from mitotic division of a plant stem cell in organism (B) is …………… chromosomes.

7
14
21
28

•All the following cells are similar except ………….

Ovule in plant
Ovum in human
Pollen grain in plant
human male testis cells

•from the opposite graph, it can be concluded that

there is an inversely relation between the number of chromosomes and the degree of evolution of the living organism.
the number of genes carried on the chromosomes differs according to the type of the living organism.
Drosophila contains genetic material more than the frog.
all the living organisms share in the genetic characters carried on the chromosomes.

•Which of the following can’t be determined when studying the opposite karyotype?

The sex of the living organism.
The number of autosomes shows
The number of sex chromosomes
The somatic traits of the living organism

Sec1 – U3: Inheritance of traits

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