1.

Answer the following questions: A. State and explain the law of dominance as proposed by Mendel.B. How would phenotypes of monohybrid F1 and F2 progeny showing incomplete dominance in Snapdragon and co-dominance in human blood group be different from Mendelian monohybrid F1 and F2 progeny ? Explain.

Answer»

A. This law states that when two alternative forms of a trait or character (genes or alleles) are present in an organism, only one factor expresses itself in F1 progeny and is called dominant while the other that remains masked is called recessive. The characters are controlled by discrete units called factors. These factors occur in pairs.

B. 

Mendelian monohybrid crossIncomplete dominanceCo-dominance
F1All members resemble the parent with dominant trait.All members do not resemble either of the two parents but show an intermediate trait.Blood groups of all members resemble combination of dominant traits of both the parents
F2Both the parental traits reappear.Both the parental traits and an intermediate trait appear.Both the parental traits as well as the co-dominant trait appear.


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