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Dihybrid Crosses. Mendel’s Peas. In addition to Mendel’s monohybrid cross experiments, he also studied the probability of inheriting 2 separate traits Example: Seed colour and seed shape Seeds can be green or yellow; they can also be wrinkled or smooth

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mendel s peas
Mendel’s Peas
  • In addition to Mendel’s monohybrid cross experiments, he also studied the probability of inheriting 2 separate traits
  • Example: Seed colour and seed shape
    • Seeds can be green or yellow; they can also be wrinkled or smooth
    • What’s the probability of getting green, wrinkled seeds?
consider the following
Consider the following:

Yellow seeds = Y Green seeds = y

Round seeds = R Wrinkled seeds = r

If a pea plant is heterozygous for both traits, how many different sex cells can it produce?

YyRr

If 2 plants, heterozygous for both traits are crossed, what types of offspring are possible?

does inheriting yellow seeds change the probability of the seeds being wrinkled
Does inheriting yellow seeds, change the probability of the seeds being wrinkled?
  • NO! Traits are inherited independently from one another because alleles are on separate chromosomes.
  • One chromosome from each homologous pair is randomly assigned to each sex cell during meiosis.
  • This is known as the Law of Independent Assortment.
  • It’s like flipping a coin for every trait and chance has no memory: flipping ‘heads’ the first time, does not make it more likely that you will flip ‘tails’ the next time.