Question

Discuss how Mendel's monohybrid results served as the basis for all but one of his postulates. Which postulate was not based on these results? Why?

Answer 1

Explanation:

When two independent events occur simultaneously, the probability of the two outcomes occurring in combination is equal to the product of their individual probabilities of occurrence.

Independent assortment cannot be demonstrated by a monohybrid cross because two gene pairs must be involved to do so.

Answer 2

Answer :-

Independent assortment can not be observed in a monohybrid cross because for independent assortment to be shown, 2 pairs genes present on the arms of a non- homologous chromosome pair are needed to exist.

Hence, independent assortment can be observed in dihybrid crosses only.

Extras :-

• Gregor Johann Mendel is considered to be the father of genetics.
• Gregor Johann Mendel is popularly known as G.J. Mendel among modern scientists.
• Mendel proposed four postulates and three laws completely based on his own experiments that he conducted on several plants, the main of all being Garden Pea plants.
• Three of the four postulates proposed by Mendel were applicable on both monohybrid and dihybrid types of crosses while one of them was applicable only on dihybrid crosses.
• POSTULATE 1- Every character is controlled by paired factors.
• POSTULATE 2- Postulate of dominance.
• POSTULATE 3- Postulate of segregation.
• POSTULATE 4- Postulate of independent assortment.
• The first and the second postulate together constitute the first law which is known as the LAW OF DOMINANCE.
• The third postulate on its own is the only postulate that constitutes the second law which is known as the LAW OF SEGREGATION.
• The fourth postulate on its own is the only postulate that constitutes the third law which is known as the LAW OF INDEPENDENT ASSORTMENT.