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Biology genetics hw Due: 2nd December 2014 What the letters DNA stand for (d) Term that means the DNA has 2 strands that are twisted together (dh) There are 23 pairs of these in most human cells (c) Sperm and/ or egg cells (g) Name: ………………………………………… Allele that is used even if there is only one copy of it present (d) Part of the cell where chromosomes are found (n) One of these is made from many thousands of different genes (c) Man who first recorded the pattern in which traits are passed between generations (M) Small section of DNA that codes for a particular trait or characteristic (g) 2 reasons Mendel’s work was not recognised til after his death. The type of molecule which is built using the DNA code as instructions (p) Type of plants used by Mendel in his experiments (p) Type of cell that only has 23 single chromosomes, instead of 23 pairs (g) Different forms of one particular gene (a) When gametes join together (f) Each gene codes for a particular combination of ………… ………… (aa) Mendel’s “inherited factors” are now called ………….. / ………….. (g / c) Part of the cell which uses the DNA code to build proteins (r) Allele that is expressed only when there is no dominant allele to take over (r) The sex chromosome in males is …… and in females is ……. (20 marks) When scientists look at dividing cells under a microscope, they can see strands that contain a chemical called DNA. A photograph of these strands can be cut up and re-arranged. The diagram shows an arrangement of the strands from a human cell. 1. What name is given to the strands containing DNA shown in the diagram? alleles chromosomes genes 2. How can you tell from the diagram that the cell was taken from a man not a woman? 3. How can you tell from the diagram that the strands are from a body cell and not from a gamete? 3. Which part of the cell would these strands have been found in? Lexie Munro 2014 (4 marks) Total………………. (max 24 + 3 for stretch) Biology genetics hw Due: 2nd December 2014 Name: ………………………………………… STRETCH A certain gene codes for the production of an enzyme called ‘HEXA’. One human genetic disorder causes damage to nerve cells in the brain.This disorder is caused by a small change in the DNA of the HEXA gene. People with this disorder make a changed HEXA enzyme that does not work. Explain how a change in the DNA of the HEXA gene can result in the production of a changed HEXA enzyme that does not work. (3 marks) Lexie Munro 2014 Total………………. (max 24 + 3 for stretch)