Mendel crossed a homozygous pea plant having yellow and round seeds with another pea plant bearing green and wrinkled seeds. He found that in some of the F2 population new combination of parental characters were observed. How will you explain the appearance of a new combination of parental characters in F2-offsprings? Support your answer with the help of Punnett square.
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Describe S.L. Miller’s experiment. Comment on the observations he made and his contribution towards the origin of life on Earth.
When two pairs of traits are combined in a hybrid segregation of one pair of character is independent of the other pair of the characters.
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Miller’s experiment:
• In 1953, S.L. Miller, created similar conditions in a laboratory scale as he believed to have existed during Earth's former years.
• He created electric discharge in a closed flask containing
• CH4, H2, NH3 and water vapour at 800 degrees C.
Observation:
1. He observed formation of amino acids. In similar experiments others observed, formation of sugars, nitrogen bases, pigment and fats.
Contribution:
This experiment helped theorize the theory of abiogenesis. The first form of life arose slowly through evolutionary forces from non- living molecules.
Couldn't generate an explanation.
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