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Unit 4 : Genetics

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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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Quiz by cloud.berry, updated more than 1 year ago
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Created by cloud.berry almost 11 years ago
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Resource summary

Question 1

Question
The largest organelle in a cell is the ____ .
Answer
  • Nucleus
  • Mitochondria
  • Cytoplasm
  • Plasma membrane

Question 2

Question
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.
Answer
  • Nucleus | hereditary material
  • Nucleus | gene
  • Cytoplasm | chromosome

Question 3

Question
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 ____ .
Answer
  • Chromosome | DNA | paired | the full length | protein
  • Chromosome | DNA | separate | for half | histones
  • Chromatid | DNA | linked | the full length | protein

Question 4

Question
A pair of genes with the same alleles are called ____ .
Answer
  • Homozygous
  • Heterozygous
  • Homologous

Question 5

Question
When the ____ chromosomes have paired up closely, each pair is called a ____.
Answer
  • Homologous | bivalent
  • Homozygous | Bivalent

Question 6

Question
Crossing over occurs in ____ .
Answer
  • Prophase I
  • Metaphase I
  • Prophase II
  • Metaphase II
  • Anaphase I
  • Anaphase II
  • Telophase I
  • Telophase II
  • Cytokinesis

Question 7

Question
The four ____ cells produced in meiosis differ genetically from each other because of ____ & ____ .
Answer
  • Haploid | Independent assortment | Crossing over
  • Diplod | Independent assortment | Crossing over

Question 8

Question
Mutations occurring in the body cells of multicellular organisms are called ____ mutations.
Answer
  • Somatic
  • Nomatic
  • Domatic
  • Lomatic
  • Homatic
  • Comatic

Question 9

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

Question 10

Question
Non - disjunction is the term given to the ____ and go to opposite poles during the nuclear division of the nucleus.
Answer
  • Failure of a pair chromatids to separate
  • Success of a pair of chromatids separating
  • Failure of a pair of chromosomes to separate

Question 11

Question
People with down syndrome have an extra chromosome __ , giving them a total of 47 chromosomes.
Answer
  • 21
  • 9
  • 7
  • 23
  • 1
  • 3
  • 11

Question 12

Question
In chromosome mutations there is a change in the ____ or ____ of ____ . Gene mutations are changes in the ____ of ____ in the ____ of a gene.
Answer
  • Number | sequence | bases | sequence | genes | DNA
  • Number | sequence | genes | sequence | bases | DNA

Question 13

Question
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.
Answer
  • Glu | Pro
  • Glu | His
  • Va | Glu
  • Leu | Val
  • Thr | Pro
  • Glu | Val

Question 14

Question
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 ____ .
Answer
  • Oxygen | protein | alpha | beta
  • Carbon dioxide | hydrogen | alpha | beta

Question 15

Question
The gene that codes for the amino acid sequence of beta haemoglobin occurs on chromosome ____ .
Answer
  • 11
  • 10
  • 21
  • 1
  • 23
  • 14
  • 13
  • 12

Question 16

Question
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.
Answer
  • A | T
  • T | A
  • C | A
  • A | C
  • G | C
  • C | G
  • C | T

Question 17

Question
Haemophilia is a ____ condition because the genes controlling the production of the blood proteins concerned are located on the ____ chromosome .
Answer
  • Sex - linked | X
  • Sex - linked | Y

Question 18

Question
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 __.
Answer
  • 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

Question 19

Question
Ways of checking for sickle cell anaemia in embryos are:
Answer
  • blood test on the mother
  • Amniocentesis
  • chorionic villus sampling
  • blood test on the father
  • X ray of the embryo

Question 20

Question
The effects on the properties of the haemoglobin molecule if this base substitution occurs are:
Answer
  • 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.

Question 21

Question
The inheritance of a single characteristic is known as a monohybrid cross.
Answer
  • True
  • False

Question 22

Question
If alleles for a gene are different, they are said to be ___.
Answer
  • homozugous
  • homologous
  • heterozygous
  • heterologous

Question 23

Question
The ___ is the way in which the ___ of an organism is expressed- including the ___ of the organism.
Answer
  • genotype | phenotype
  • phenotype | genotype
  • appearance
  • beauty

Question 24

Question
when both alleles are expressed they are known as ___.
Answer
  • prodominant
  • the same
  • predominant
  • cosubmissive
  • equally powerful
  • codominant
  • this can never happen.

Question 25

Question
A gene is a pair of alleles that both affect the phenotype of an organism when present in a heterozygote.
Answer
  • True
  • False

Question 26

Question
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.
Answer
  • True
  • False

Question 27

Question
Examples of recessive conditions controlled by genes on the X chromosome are :
Answer
  • Haemohpilia
  • Sickle cell anaemia
  • Red-green colour blindness
  • Duchenne muscular dystrophy
  • Blue-green colour blindness
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