By 1902, the movement of structures called _______ during meiosis had been worked out, which Walter Sutton and Theodore Boveri noted was parallel to the behaviour of genes.
By 1902, the chromosome movement during meiosis had been worked out, which led Sutton and Boveri to note that the behaviour of chromosomes was parallel to the behaviour of genes.
Question 272 of 519
📘 CLASS XII
Thomas Hunt Morgan worked with Drosophila melanogaster because it could be grown on simple medium and completed its life cycle in about _______ weeks.
Drosophila melanogaster complete their life cycle in about two weeks.
Question 273 of 519
📘 CLASS XII
Morgan coined the term _______ to describe the physical association of genes on a chromosome, noting that parental gene combinations were much higher than non-parental types.
Morgan coined the term linkage to describe this physical association of genes on a chromosome.
Question 274 of 519
📘 CLASS XII
Morgan found that the tightly linked genes white and yellow in Drosophila showed only _______ per cent recombination.
The genes white and yellow were very tightly linked and showed only 1.3 per cent recombination.
Question 275 of 519
📘 CLASS XII
Traits generally controlled by three or more genes, such as human height or skin colour, are called _______ traits.
Traits generally controlled by three or more genes are called as polygenic traits.
Question 276 of 519
📘 CLASS XII
Besides the involvement of multiple genes, _______ inheritance also takes into account the influence of environment, as seen in human skin colour.
Besides the involvement of multiple genes, polygenic inheritance also takes into account the influence of environment.
Question 277 of 519
📘 CLASS XII
The underlying mechanism of pleiotropy in most cases is the effect of a single gene on _______ pathways which contribute towards different phenotypes.
The underlying mechanism of pleiotropy in most cases is the effect of a gene on metabolic pathways which contribute towards different phenotypes.
Question 278 of 519
📘 CLASS XII
Henking (1891) traced a specific nuclear structure during spermatogenesis in insects and named it the _______ body, which was later identified as the X-chromosome.
Henking (1891) traced a specific nuclear structure all through spermatogenesis in a few insects, and he gave a name to this structure as the X body.
Question 279 of 519
📘 CLASS XII
Thomas Hunt Morgan worked with the tiny fruit fly, Drosophila melanogaster, to provide experimental verification of the chromosomal theory of inheritance.
Thomas Hunt Morgan worked with the tiny fruit flies, Drosophila melanogaster, which were found very suitable for studies related to the chromosomal theory of inheritance.
Question 280 of 519
📘 CLASS XII
Drosophila melanogaster complete their life cycle in about _______ weeks, making them suitable for genetic studies.
Drosophila melanogaster complete their life cycle in about two weeks.
