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Compare in any three ways the chromosoma...

Compare in any three ways the chromosomal theory of inheritance as proposed by Sutton and Boveri with that of experimental results on pea plant presented by Mendel.
OR
(a) Explain linkage and recombination as put forth by T.H. Morgan based on his observations with Drosophila melanogaster crossing experiment.
(b) Write the basis on which Alfred Sturtevant explained gene mapping.

Text Solution

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Chromosome theory of inheritance proposed by Sutton and Bovery :
1. They said that chromosomes are linear structures with genes located at specific sites.
2. It states simply that chromosomes which are passed from one generation to the next.
3. Over a period of time, random mutation creates changes in the DNA sequence of a gene.
Theory correctly explains the mechanism underlying the laws of Mendelian inheritance by identifying chromosomes with the paired factors (particles) required by Memdel's Laws.
OR
N/A
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Knowledge Check

  • Read the following statements and find out the incorrect statement. a. Though the genotypic ratios can be calculated using mathematical probability, by simply looking at the phenotype of recessive trait, it is not possible to know the genotypic composition. The 1/4 : 1/2 : 1/4 ratio of TT : Tt : tt is mathematically condensable to form of the binomial expression (ax + by)^(2) , that has the gametes bearing genes T and t in equal frequency of 1/2. c. Based on his observations on dihybrid crosses Mendel proposed two rules that are called Principles or Laws of Inheritance : the First Law or Law of Dominance and the Second Law or Law of Segregation. d. If in test cross, all the progenies shows dominant trait then the unknown parent is heterozygous dominant. e. ABO blood group controlled by three alleles I^(A), I^(B) " and i. "I^(A) " and " I^(B) produce a slightly different type of the sugar while allele i doesn't produce any sugar.

    A
    a, c and d
    B
    b, d and e
    C
    a and c only
    D
    c and d only
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