FORUM DESCRIPTION You are covering Mendel\'s laws on inheritance in lectures and

Question

FORUM DESCRIPTION You are covering Mendel's laws on inheritance in lectures and recitation this week. German abbot Gregor Mendel published his famous pea results in 1866, to what can be described as a general shrug. Fast forward 35 year when two scientists, Hugo de Vries and Carl Correns, independently arrived to the same conclusions and rediscovered his work. This would catch the general attention and eventually redefined the fields of genetics, evolutionary biology, and population genetics (Correns' paper is available for your interest on Blackboard; de Vries' paper was written in French). In 1904, William Bateson, Edith Saunders, and Reginald Punnett (of the Punnett square fame) published odd results: when selfing pea plants investigating pollen shape and flower color, the F2 generation deviated dramatically from the Mendelian 9:3:3:1 ratio expected of the F2 generation looking at 2 traits: Phenotype Purple, long Purple, round Red, long Red, round Total Observed 1528 106 Expected 1199 400 400 133 2132 381 2132 Discuss how and why those numbers deviate from Mendelian expectations (i.e is there any pattern of divergence in the data? what might be causing this divergence?) Why are these surprising or not surprising? Note that purple flowers and long pollen are the dominant phenotypes, while red flowers and round pollen are recessive. I am not looking for a right answer here (we will coven that in a few topics), simply for you to critically evaluate results and have a discussion about results. In that view, it is important that your responses to classmates extend the discussion or answer questions or misunderstandings you may detect. As such I will look more for constructive conversation than getting the right answer from the Internet, so you have to play along and show that you reflect upon the data.

Explanation / Answer

Ans- this data is divergent from mendalian expectations as the values of observed phenotypes are different from the expected value. This divergence may be due to some mutation or evolutionary process. Yes purple and long are dominant phenotype in this case and red , round are recessive.

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