IB Biology Unit 3 Genetics

Which enzymes are needed to produce recombinant plasmids that are used in gene transfer?

• DNA polymerase and ligase

• DNA polymerase and restriction enzymes

• Restriction enzymes and ligase

• Helicase and restriction enzymes

Which one of the following happens in Anaphase II of meiosis?

• Homologous chromosomes are pulled to opposite poles of the cell

• Homologous chromosomes move to the equator of the cell

• Sister chromatids are pulled to opposite poles of the cell

• Pairs of sister chromatids move to the equator of the cell

A cell with a diploid number of 12 chromosomes undergoes meiosis. What will be the product at the end of meiosis?

• 2 cells each with 12 chromosomes

• 4 cells each with 6 chromosomes

• 2 cells each with 6 chromosomes

• 4 cells each with 12 chromosomes

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The following is a DNA gel. The results are from a single probe showing a DNA profile for a man, a woman and their four children.

Which child is least likely to be the biological offspring of the father?

• Child 1

• Child 2

• Child 3

• Child 4

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A parent organism of unknown genotype is mated in a test cross. Half of the offspring have the same phenotype as the parent. What can be concluded from this result?

• The parent is heterozygous for the trait.

• The trait being inherited is controlled by many genes.

• The parent is homozygous dominant for the trait.

• The parent is homozygous recessive for the trait.

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Which process results in the greatest genetic variation in a population?

• Meiosis

• Mitosis

• Cytokinesis

• Natural selection

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NGSS.HS-LS3-2

The diagram below shows a cell during meiosis.

How many chromosomes would each daughter cell have at the end of meiosis?

• 8

• 4

• 2

• 1

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NGSS.HS-LS3-2

The pedigree shows which members of a family were Rhesus positive (■ and •) and Rhesus negative (□ and O). The allele for Rhesus positive blood (Rh+) is dominant over the allele for Rhesus negative blood (R-).

Which are possible genotypes of the individuals numbered I, II and III?

• I = Rh⁺ Rh⁺ II = Rh⁺ Rh⁺ III = Rh⁺ Rh^-

• I = Rh⁺ Rh⁺ II = Rh⁺ Rh^- III = Rh⁺ Rh⁺

• I = Rh⁺ Rh⁺ II = Rh⁺ Rh^- III = Rh⁺ Rh^-

• I = Rh⁺ Rh^- II = Rh⁺ Rh^- III = Rh⁺ Rh⁺

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NGSS.HS-LS3-2

NGSS.HS-LS3-1

The diagram below shows a cell in meiosis.

What can be deduced from this diagram, regarding the stage of meiosis shown and the haploid number of chromosomes in this cell?

• Stage = Metaphase I; Haploid number = 6

• Stage = Prophase I; Haploid number = 3

• Stage = Prophase I; Haploid number = 6

• Stage = Metaphase I; Haploid number = 3

What is a possible consequence of a single base substitution mutation occurring in a gene?

• Amino acids in two polypeptides coded for by the gene are changed.

• All of the codons from the mutation onward are changed.

• The gene will not code for a protein

• The protein produced could have the same amino acid sequence

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