Advertisements
Advertisements
Question
Explain with an example how single genes affect multiple traits and alleles the phenotype of an organism.
Solution
In Pleiotropy, the single gene affects multiple traits and alters the phenotype of the organism. The Pleiotropic gene influences a number of characters simultaneously and such genes are called pleiotropic genes. Mendel noticed pleiotropy while performing breeding experiments with peas (Pisum sativum).
Peas with purple flowers, brown seeds, and dark spot on the axils of the leaves were crossed with a variety of peas having white flowers, light-coloured seeds and no spot on the axils of the leaves, the three traits for flower colour, seed colour and a leaf axil spot all were inherited together as a single unit. This is due to the pattern of inheritance where the three traits were controlled by a single gene with dominant and recessive alleles. Example: sickle cell anemia.
RELATED QUESTIONS
In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype
How many different kinds of gametes will be produced by a plant having the genotype AABbCC?
In Mendel’s experiments with the garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?
In his classic experiments on Pea plants, Mendel did not use
The genes controlling the seven pea characters studied by Mendel are known to be located on how many different chromosomes?
What is meant by true-breeding or pure breeding lines/strain?
Give the names of the scientists who rediscovered Mendelism.
