Genetics - Biology Forum

last updated by

JackBean 12 years, 12 months ago

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- November 18, 2011 at 3:21 pm #15701
  jsmith613
  Participant
  http://www.xtremepapers.com/AQA/Human%2 … -JAN06.pdf
  If we look at Q6a) we are asked to find Genotype of parents (Aabb and aaBb) and the gametes formed.
  What gametes are formed? and why?
  thanks
  also, how is part b) calculated?
- November 18, 2011 at 3:25 pm #108227
  jsmith613
  Participant
  are the gametes of Aabb
  Aa and bb OR Ab and ab
  why?
- November 18, 2011 at 4:03 pm #108228
  daniel.kurz
  Participant
  Start by drawing out the di-punnett squares to determine the genotypes of the parents and then from that you can readily figure out what the gametes produced from each parent are going to be based on their genotype.
- November 19, 2011 at 5:56 pm #108235
  jsmith613
  Participant
  so when they say the gametes are inherited independantly, what does that mean?
- November 19, 2011 at 10:31 pm #108237
  jsmith613
  Participant
  oh i get it
  thanks
- November 21, 2011 at 11:46 am #108283
  JackBean
  Participant
  the gamete must contain exactly one from each trait (e.g. you could have three traits marked a,b and c, each having two alleles A,a; B,B; C,c -> then the diploid organism can have any combination e.g. AaBBcc or AABbCC etc., but the gamete has one from each thus e.g. AbC or abc, but not aa or Bb etc.)
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