4.2 - Meiosis Revision Questions

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IB BiologyTopic 4: Genetics

Revision Questions

4.2 Meiosis Revision

Questions

1. If the amount of DNA in a haploid gamete is represented by , what is the net

quantity of DNA in a cell from the same organism at the start of meiosis?

A. 0.

!.

". #

D. $ (Total 1 mark)

#. %hat happens in crossing o&er?

A. '(change of genetic material between homologous chromosomes

!. '(change of genes during metaphase of mitosis

". )andom distribution of chromosomes during meiosis

D. *omologous chromosomes fail to separate during meiosis(Total 1 mark)

+. he diagram below shows the cell of an organism going through the first di&ision of

meiosis.

*ow many different combinations are possible for these chromosomes in the

haploid cells formed by meiosis?

A. #!. -

".

D. /(Total 1 mark)

$. %hich of the following statements about homologous chromosomes is correct?

A. 'ach gene is at the same locus on both chromosomes.

!. hey are two identical copies of a parent chromosome which are attached

to one another at the centromere.

". hey always produce identical phenotypes.

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IB BiologyTopic 4: Genetics

Revision QuestionsD. hey are chromosomes that ha&e identical genes and alleles.

(Total 1 mark)

. %hich of the following types of information are needed to construct a aryotype?

I. i2e of the chromosomes

II. 3ene mutations of the chromosomes

III. Age of the indi&idual

A. I only

!. II only

". I and II only

D. I, II and III(Total 1 mark)

-. In the following diagram, which pair represents homologous chromosomes?

A. 1 and #

!. + and $

". # and

D. $ and -(Total 1 mark)

4. %hich of the following will promote &ariation in a species?

I. 5eiosis

II. 6ertili2ation

III. Natural selection

A. I only

!. II only

". I and II only

D. I, II and III(Total 1 mark)

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IB BiologyTopic 4: Genetics

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. %hat does the aryotype below correspond to?

A. A normal male

!. A normal female

". A female with Down syndrome

D. A male with Down syndrome(Total 1 mark)

/. %hich phase of cell di&ision is photographed in order to mae a aryotype?

A. Anaphase of mitosis

!. Anaphase I of meiosis

". 5etaphase of mitosis

D. 5etaphase II of meiosis

(Total 1 mark)

10. If the haploid number of a species is 1$, how many chromatids will there be in

metaphase I in a di&iding diploid cell?

A. 4

!. 1$

". #

D. -(Total 1 mark)

11. he aryotype below shows the chromosomes from a person with Down

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IB BiologyTopic 4: Genetics

Revision Questionssyndrome.

7ource8 9.. Department of 'nergy *uman 3enome :rogram ;genomics.energy.go&,

genomicscience.energy.go&utline how Down syndrome occurs due to meiosis.

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;c< Determine, gi&ing a reason, the se( of the person in the aryotype.

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1#. '(plain how se(ual reproduction can e&entually lead to e&olution in offspring.(8)

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IB BiologyTopic 4: Genetics

Revision Questions

1+. Describe aryotyping and one application of its use.(4)

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IB BiologyTopic 4: Genetics

Revision Questions