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  • Gregor Mendal 
  • Genetics?
  • Mendal's Second Experiment 
  • If I make a dihybird cross, what would be the phenotypes? Would the genotypes be heterozygous or homozygous.
  • Mendal's Second Experiment 
  • Yellow and round was dominant. Green and wrinkled was recessive.
  • Gregor Mendel was an Austrian monk who found  modern science  of genetics.  He taught for 14 years working in a monastery and high  school. He was also in charge of monastery garden.
  • Mendal's Second Experiment
  • Let's see what happens when I let them self-pollinate!
  • Mendel  wanted to know if the  characteristics were dependent or independent. It was a dihybrid cross, which crosses two different breeds. He started with a true breed generation. The two parent plants were a homozygous  generation meaning they had the same genotype. For example, PP or pp. One seed as yellow with round seeds and the other was green with wrinkled seeds.
  • Mendal's Second Experiment 
  • The recessive gene reappeared. The alleles have changed to prove my law right!
  • He found that the yellow color was   dominant. Dominant means that the dominant trait will appear over any other traits. Green was the   recessive. Recessive means that it will only appear if two recessives are present in the genotype. The round seed is dominant and the wrinkled seed  is recessive.
  • Mendal's Second Experiment
  • I have now made the law of independent assortment.
  • The F1 generation produces 100% round and  yellow seeds.  Which made the recessive traits disappear.  All the plants in  F1 were heterozygous genotypes. Heterozygous means the alleles are different. Alleles are alternative forms of a genes. Then  he let it self-pollinate to get F2. 
  • The recessive traits reappeared in the  F2 generation.   F2 produced a combination of traits of wrinkled and yellow seeds. Also, round and green seeds was produced. The phenotypes  of the plants was the physical characteristics like if the plant was yellow or green with round or wrinkled seeds.
  • Mendel then accepted the law of independent assortment. The law of independent assortment is the inheritance will not affect the inheritance of another.
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