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IBD Biology (Unit 4 : Genetics) Quiz on Unit 4 : Genetics, created by cloud.berry on 28/05/2013.

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Unit 4 : Genetics

Question 1 of 27

1

The largest organelle in a cell is the ____ .

Select one of the following:

  • Nucleus

  • Mitochondria

  • Cytoplasm

  • Plasma membrane

Explanation

Question 2 of 27

1

The first thing to divide during cell division is the ____ which controls and directs the activities of the cell throughout life; it contains the ____ which is passed from generation to generation during reproduction.

Select one of the following:

  • Nucleus | hereditary material

  • Nucleus | gene

  • Cytoplasm | chromosome

Explanation

Question 3 of 27

1

Each ____ consists of ____, a huge molecule consisting of 2 ____ strands in the form of a double helix which runs ____ of the chromosome and is supported by ____ .

Select one of the following:

  • Chromosome | DNA | paired | the full length | protein

  • Chromosome | DNA | separate | for half | histones

  • Chromatid | DNA | linked | the full length | protein

Explanation

Question 4 of 27

1

A pair of genes with the same alleles are called ____ .

Select one of the following:

  • Homozygous

  • Heterozygous

  • Homologous

Explanation

Question 5 of 27

1

When the ____ chromosomes have paired up closely, each pair is called a ____.

Select one of the following:

  • Homologous | bivalent

  • Homozygous | Bivalent

Explanation

Question 6 of 27

1

Crossing over occurs in ____ .

Select one of the following:

  • Prophase I

  • Metaphase I

  • Prophase II

  • Metaphase II

  • Anaphase I

  • Anaphase II

  • Telophase I

  • Telophase II

  • Cytokinesis

Explanation

Question 7 of 27

1

The four ____ cells produced in meiosis differ genetically from each other because of ____ & ____ .

Select one of the following:

  • Haploid | Independent assortment | Crossing over

  • Diplod | Independent assortment | Crossing over

Explanation

Question 8 of 27

1

Mutations occurring in the body cells of multicellular organisms are called ____ mutations.

Select one of the following:

  • Somatic

  • Nomatic

  • Domatic

  • Lomatic

  • Homatic

  • Comatic

Explanation

Question 9 of 27

1

A mutation is a change in the ____ or ____ of ____ which may result in a ____ of an organism.

Select one of the following:

  • Type | genetic structure | the cell | change in the characteristics

  • Amount | chemical structure | DNA | change in the characteristics

  • Amount | base structure | DNA | change in the functions

Explanation

Question 10 of 27

1

Non - disjunction is the term given to the ____ and go to opposite poles during the nuclear division of the nucleus.

Select one of the following:

  • Failure of a pair chromatids to separate

  • Success of a pair of chromatids separating

  • Failure of a pair of chromosomes to separate

Explanation

Question 11 of 27

1

People with down syndrome have an extra chromosome __ , giving them a total of 47 chromosomes.

Select one of the following:

  • 21

  • 9

  • 7

  • 23

  • 1

  • 3

  • 11

Explanation

Question 12 of 27

1

In chromosome mutations there is a change in the ____ or ____ of ____ . Gene mutations are changes in the ____ of ____ in the ____ of a gene.

Select one of the following:

  • Number | sequence | bases | sequence | genes | DNA

  • Number | sequence | genes | sequence | bases | DNA

Explanation

Question 13 of 27

1

Sickle cell anaemia is brought about by base substitution which is an example of a gene mutation. Here ____ is substituted with ____ which causes the mutation.

Select one of the following:

  • Glu | Pro

  • Glu | His

  • Va | Glu

  • Leu | Val

  • Thr | Pro

  • Glu | Val

Explanation

Question 14 of 27

1

Haemoglobin, the ____ - transporting pigment of red cells, is made of 4 ____ molecules that interlock and form a compact molecule -two of the haemoglobin molecules are known as ____ and the other two as ____ .

Select one of the following:

  • Oxygen | protein | alpha | beta

  • Carbon dioxide | hydrogen | alpha | beta

Explanation

Question 15 of 27

1

The gene that codes for the amino acid sequence of beta haemoglobin occurs on chromosome ____ .

Select one of the following:

  • 11

  • 10

  • 21

  • 1

  • 23

  • 14

  • 13

  • 12

Explanation

Question 16 of 27

1

The gene that codes for beta haemoglobin is prone to a substitution of the base ____ to ____ in a codon for the amino acid glutamic acid.

Select one of the following:

  • A | T

  • T | A

  • C | A

  • A | C

  • G | C

  • C | G

  • C | T

Explanation

Question 17 of 27

1

Haemophilia is a ____ condition because the genes controlling the production of the blood proteins concerned are located on the ____ chromosome .

Select one of the following:

  • Sex - linked | X

  • Sex - linked | Y

Explanation

Question 18 of 27

1

As in mitosis, chromosomes replicate to form chromatids during interphase, however, in meiosis __ ___ chromosomes ___ and by the end of meiosis ___ they have ___ but the chromatids they consist of do not separate until meiosis __.

Select one of the following:

  • II | homologous | pair up | I | cross over | II

  • I | homologous | separate | I | separated | I

  • I | homologous | pair up | I | separated | II

  • I | homozygous | separate | II | separated | I

Explanation

Question 19 of 27

1

Ways of checking for sickle cell anaemia in embryos are:

Select one or more of the following:

  • blood test on the mother

  • Amniocentesis

  • chorionic villus sampling

  • blood test on the father

  • X ray of the embryo

Explanation

Question 20 of 27

1

The effects on the properties of the haemoglobin molecule if this base substitution occurs are:

Select one or more of the following:

  • they tend to clump together

  • they form short fibres that distort the red cells into plump disk shapes.

  • they become low in viscosity

  • they form unusually long fibres that distort the red cells into sickle shapes.

  • they become too large for the blood vessels.

Explanation

Question 21 of 27

1

The inheritance of a single characteristic is known as a monohybrid cross.

Select one of the following:

  • True
  • False

Explanation

Question 22 of 27

1

If alleles for a gene are different, they are said to be ___.

Select one or more of the following:

  • homozugous

  • homologous

  • heterozygous

  • heterologous

Explanation

Question 23 of 27

1

The ___ is the way in which the ___ of an organism is expressed- including the ___ of the organism.

Select one of the following:

  • genotype | phenotype

  • phenotype | genotype

  • appearance

  • beauty

Explanation

Question 24 of 27

1

when both alleles are expressed they are known as ___.

Select one or more of the following:

  • prodominant

  • the same

  • predominant

  • cosubmissive

  • equally powerful

  • codominant

  • this can never happen.

Explanation

Question 25 of 27

1

A gene is a pair of alleles that both affect the phenotype of an organism when present in a heterozygote.

Select one of the following:

  • True
  • False

Explanation

Question 26 of 27

1

A gene is the basic unit of inheritance by which inherited characteristics are transferred from parent to offspring, consisting of a length of DNA on a chromosome.

Select one of the following:

  • True
  • False

Explanation

Question 27 of 27

1

Examples of recessive conditions controlled by genes on the X chromosome are :

Select one or more of the following:

  • Haemohpilia

  • Sickle cell anaemia

  • Red-green colour blindness

  • Duchenne muscular dystrophy

  • Blue-green colour blindness

Explanation

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