Michael Jardine
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Michael Jardine
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GEGE2001 Quiz 4

Question 1 of 10

1

Individuals heterozygous for a reciprocal translocation often have, at metaphase 1 of meiosis:

Select one of the following:

  • Both a chromosome bridge and a fragment

  • A loop in a bivalent

  • Large number of unpaired chromosomes

  • None of the other answers

  • A quadrivalent

Explanation

Question 2 of 10

1

The maximum value of r, the recombination percentage, is 50% because:

Select one of the following:

  • Chromosomes have 2 chromatids

  • Crossing over is between 2 of the 4 chromatids present in a bivalent

  • In females, only one of the 4 products of meiosis develops into an egg, but in males all products form sperm

  • None of the other answers

  • At anaphase II, the bivalents split into the 2 chromosomes

Explanation

Question 3 of 10

1

The coding sequence of a gene is called

Select one of the following:

  • An exon

  • A partitioning sequence

  • A promoter

  • An intron

  • An operon

Explanation

Question 4 of 10

1

Non-coding DNA can best be described as:

Select one of the following:

  • DNA that codes for factors that regulate gene expression

  • Including stretches of DNA that may have an as yet undefined function for the organism

  • DNA that is composed of repetitive sequences of bases

  • DNA that is the promoter region for genes

  • “junk” DNA that is of little or no value to the organism

Explanation

Question 5 of 10

1

A “jumping gene” is more often called a:

Select one of the following:

  • Non-coding DNA element

  • Transcription sequence

  • Transposable element

  • Partitioning sequence

  • Repetition sequence

Explanation

Question 6 of 10

1

Given that different organisms can have sections of DNA that are almost identical, which of the following statements is CORRECT?

Select one of the following:

  • These organisms are always very closely related, as with chimpanzees and humans

  • Identical sections of DNA will always perform the same function, regardless of the organisms in which they are found

  • This DNA is usually non-functional

  • This is only true for repetitive DNA

  • This constitutes evidence of evolution of these organisms from a common ancestor

Explanation

Question 7 of 10

1

Phenotypic variation between individuals of a species:

Select one of the following:

  • Is the basis upon which natural selection acts

  • Is solely a result of genetic differences

  • Is greater than variation between members of different species

  • Has its primary source in environmental effects

  • Is a result of the deletion of specific genes

Explanation

Question 8 of 10

1

Which of the following statements about DNA is CORRECT?

Select one of the following:

  • Transposable Elements repair DNA damage

  • DNA synthesis is self-perpetuating and does not require enzyme mediation

  • Introns are segments of genes that are inserted at replication forks

  • Mitochondrial DNA is replicated in the nucleus

  • Only 2 per cent of mammalian DNA codes for proteins

Explanation

Question 9 of 10

1

Genes are being discovered using cDNA. cDNA is:

Select one of the following:

  • Created from mRNA transcripts, and therefore does not include introns

  • None of the answers are correct

  • A direct copy of the DNA at a particular gene locus

  • The complementary double-stranded DNA of a specific gene

  • Only useful if the gene product is an enzyme

Explanation

Question 10 of 10

1

Genomes are measured as:

Select one of the following:

  • The number of base pairs of DNA in a somatic cell

  • The total number of base pairs of DNA in a haploid set of different chromosomes of an organism

  • None of the answers are correct

  • The number of chromosomes in a somatic cell of an organism

  • The number of genes found in the nuclear DNA of an organism

Explanation

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