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5 Written questions

5 Matching questions

  1. Crossing over
  2. Diploid
  3. Dominant
  4. Initiator codon
  5. Programmed cell death
  1. a Characteristic in which the allele responsible is expressed in the phenotype even in those with heterozygous genotypes.
  2. b The triplet code recognised by the ribosome that signals the start point for translation. Almost invariably a methionine codon (ATG).
  3. c Where non-sister chromatids exchange alleles during prophase I of meiosis.
  4. d Having two sets of chromosomes (eukaryotic cell or organism). Denoted by 2n.
  5. e Alternative term for apoptosis.

5 Multiple choice questions

  1. A length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.
  2. A change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.
  3. Refers to the location of cells with respect to the head end (anterior) or tail end (posterior) of the body.
  4. The points where non-sister chromatids within a bivalent join, where they cross over.
  5. A change to the DNA structure altering the sequence of bases.

5 True/False questions

  1. MorphogenA substance that controls the pattern of tissue development. It is produced in a particular region of a developing organism. It diffuses to other cells, which then enter a specific developmental pathway.

          

  2. Missense mutationA change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.

          

  3. Genetic reassortmentVariation introduced due to the random orientation and subsequent segregation of maternal and paternal chromosomes during meiosis 1, or sister chromatids at meiosis 2.

          

  4. Silent mutationA change to the DNA structure altering the sequence of bases.

          

  5. Insertion/deletion mutationA change in DNA sequence involving the introduction or loss of 1- 1000s of bases.

          

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