Explain Mandel's Law of dominance 150 word
Answers
Mendel's Law of Dominance. Mendel's Law of Dominance can also be simply stated as: “In a cross of parents that are pure for contrasting traits, only one form of the trait will appear in the next generation. Offspring that are hybrid for a trait will have only the dominant trait in the phenotype.”
The Mendel's four postulates and laws of inheritance are: (1) Principles of Paired Factors (2) Principle of Dominance(3) Law of Segregation or Law of Purity of Gametes (Mendel's First Law of Inheritance) and (4) Law of Independent Assortment (Mendel's Second Law of Inheritance).
An analysis of genetic crosses depends upon an understanding of Mendel's two laws: The principle of segregation (First Law): The two members of a gene pair (alleles) segregate (separate) from each other in the formation of gametes. Half the gametes carry one allele, and the other half carry the other allele.
began with two lines of yellow peas that always bred true.3
One line consistently gave
round peas while the second always gave wrinkled peas. Mendel cross bred these two
strains by fertilizing the round strain with pollen from the wrinkled strain and fertilizing
the wrinkled strain with pollen from the round plants. The seeds from the next
generation were all round. At this point, Mendel probably asked himself, “Whatever
happened to the hereditary information about making a wrinkled pea?”
[Insert Figure 9.1 about here]
Mendel did not stop at this point. He cross-fertilized all the pea plants in this
generation with pollen from other plants in the same generation. When there progeny
matured, he noticed a very curious phenomenon—wrinkled peas reappeared! How could
this happen when all the parents of these plants had round seeds? Obviously, the middle
generation in Figure 9.1, despite being all round, still possessed the hereditary information
for making a wrinkled pea. But somehow that information was not being expressed.