exam qs (reproduction)

• analyse the data to explain why exposing pregnant mice to cigarette smoke affects the fertility of their male offspring

  fewer stem cells producing sperm

  fewer motile sperm therefore fewer sperm will reach the egg

  poor ability to cross zona pellucida therefore sperm will not reach the egg cell
• analyse the data in the table to explain why it is advantageous for the eel to have a larger egg cell

  larger egg will contain more lipid droplets

  therefore will provide more energy for the development of the embryo

  the eels larger egg is a bigger target for sperm to hit, aiding fertilisation in open water
• deduce the effects of MMS on production of sperm cells in rats

  MMS reduces sperm count

  MMS increases percentage of sperm cells with abnormalities

  as greatest effect is on percentage of sperm swimming normally MMS is likely to affect production of flagella/mitochondria