Test
Unit 4 : Genetics
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Preguntas del test (27)
1The largest organelle in a cell is the ____ .
- ANucleus
- BMitochondria
- CCytoplasm
- DPlasma membrane
2The 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.
- ANucleus | hereditary material
- BNucleus | gene
- CCytoplasm | chromosome
3Each ____ 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 ____ .
- AChromosome | DNA | paired | the full length | protein
- BChromosome | DNA | separate | for half | histones
- CChromatid | DNA | linked | the full length | protein
4A pair of genes with the same alleles are called ____ .
- AHomozygous
- BHeterozygous
- CHomologous
5When the ____ chromosomes have paired up closely, each pair is called a ____.
- AHomologous | bivalent
- BHomozygous | Bivalent
6Crossing over occurs in ____ .
- AProphase I
- BMetaphase I
- CProphase II
- DMetaphase II
- EAnaphase I
- FAnaphase II
- GTelophase I
- HTelophase II
- ICytokinesis
7The four ____ cells produced in meiosis differ genetically from each other because of ____ & ____ .
- AHaploid | Independent assortment | Crossing over
- BDiplod | Independent assortment | Crossing over
8Mutations occurring in the body cells of multicellular organisms are called ____ mutations.
- ASomatic
- BNomatic
- CDomatic
- DLomatic
- EHomatic
- FComatic
9A mutation is a change in the ____ or ____ of ____ which may result in a ____ of an organism.
- AType | genetic structure | the cell | change in the characteristics
- BAmount | chemical structure | DNA | change in the characteristics
- CAmount | base structure | DNA | change in the functions
10Non - disjunction is the term given to the ____ and go to opposite poles during the nuclear division of the nucleus.
- AFailure of a pair chromatids to separate
- BSuccess of a pair of chromatids separating
- CFailure of a pair of chromosomes to separate
11People with down syndrome have an extra chromosome __ , giving them a total of 47 chromosomes.
- A21
- B9
- C7
- D23
- E1
- F3
- G11
12In chromosome mutations there is a change in the ____ or ____ of ____ . Gene mutations are changes in the ____ of ____ in the ____ of a gene.
- ANumber | sequence | bases | sequence | genes | DNA
- BNumber | sequence | genes | sequence | bases | DNA
13Sickle cell anaemia is brought about by base substitution which is an example of a gene mutation. Here ____ is substituted with ____ which causes the mutation.
- AGlu | Pro
- BGlu | His
- CVa | Glu
- DLeu | Val
- EThr | Pro
- FGlu | Val
14Haemoglobin, 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 ____ .
- AOxygen | protein | alpha | beta
- BCarbon dioxide | hydrogen | alpha | beta
15The gene that codes for the amino acid sequence of beta haemoglobin occurs on chromosome ____ .
- A11
- B10
- C21
- D1
- E23
- F14
- G13
- H12
16The gene that codes for beta haemoglobin is prone to a substitution of the base ____ to ____ in a codon for the amino acid glutamic acid.
- AA | T
- BT | A
- CC | A
- DA | C
- EG | C
- FC | G
- GC | T
17Haemophilia is a ____ condition because the genes controlling the production of the blood proteins concerned are located on the ____ chromosome .
- ASex - linked | X
- BSex - linked | Y
18As 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 __.
- AII | homologous | pair up | I | cross over | II
- BI | homologous | separate | I | separated | I
- CI | homologous | pair up | I | separated | II
- DI | homozygous | separate | II | separated | I
19Ways of checking for sickle cell anaemia in embryos are:
- Ablood test on the mother
- BAmniocentesis
- Cchorionic villus sampling
- Dblood test on the father
- EX ray of the embryo
20The effects on the properties of the haemoglobin molecule if this base substitution occurs are:
- Athey tend to clump together
- Bthey form short fibres that distort the red cells into plump disk shapes.
- Cthey become low in viscosity
- Dthey form unusually long fibres that distort the red cells into sickle shapes.
- Ethey become too large for the blood vessels.
21The inheritance of a single characteristic is known as a monohybrid cross.
- AVerdadero
- BFalso
22If alleles for a gene are different, they are said to be ___.
- Ahomozugous
- Bhomologous
- Cheterozygous
- Dheterologous
23The ___ is the way in which the ___ of an organism is expressed- including the ___ of the organism.
- Agenotype | phenotype
- Bphenotype | genotype
- Cappearance
- Dbeauty
24when both alleles are expressed they are known as ___.
- Aprodominant
- Bthe same
- Cpredominant
- Dcosubmissive
- Eequally powerful
- Fcodominant
- Gthis can never happen.
25A gene is a pair of alleles that both affect the phenotype of an organism when present in a heterozygote.
- AVerdadero
- BFalso
26A 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.
- AVerdadero
- BFalso
27Examples of recessive conditions controlled by genes on the X chromosome are :
- AHaemohpilia
- BSickle cell anaemia
- CRed-green colour blindness
- DDuchenne muscular dystrophy
- EBlue-green colour blindness
Información
- Descripción
- IBD (Unit 4 : Genetics) Biology Test sobre Unit 4 : Genetics, creado por cloud.berry el 28/05/2013.
- Autor
- cloud.berry
- Idioma
- English
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