Question

(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.

Answer 1

Answer:

a. linkage :the physical association of two gene on the chromosomes.

recombination :the generation of non parental gene combinations.

Observation,

tight linkage shows less recombination and

loose linkage shows high recombination.

Answer 2

Experiment of T.H. Morgan

Explanation:

• Thomas Hunt Morgan, who examined organic product flies, provided the principal solid affirmation of the chromosome hypothesis
• Morgan found a change that influenced fly eye shading. He saw that the transformation was acquired diversely by male and female flies
• In Drosophila melanogaster there are 4 homologous sets of chromosomes. 2 sets of enormous autosomes, ( one somewhat littler than the other pair), 1 sets of little autosomes, and a couple of sex chromosomes
• Females regularly have two X chromosomes; guys have one X and one small Y chromosome