Gentics and Evoloution MCQ question and answer with solution | Biology Gk MCQs

Consider the following statements and choose the correct answer:
1. In the phenomenon of linkage and crossing over, the genes are arranged in a linear order in a chromosome
2. The linkage groups in an organism are equivalent to the number of chromosome pairs
3. The chances of crossing over are more between two closely placed genes as compared to the genes placed in far proximity
4. The position of genes is very definite in the chromatid

Consider the following statements regarding the DNA-mediated gene transfer and choose the correct answer:
1. DNA fragments carrying the gene to be transferred are mixed with a carrier DNA
2. They are then precipitated out with a calcium phosphate buffer
3. The precipitate is used to transform target cells
4. The Ca-precipitated DNA enters the cell by exocytosis

Any change in the sequence of nucleotides of a DNA molecule results in a change in the triplets, giving rise to

Barr body is absent in somatic cell of

The first attempt to grow angiosperm embryos in vitro under aseptic conditions was made by

Among the chemical mutagens, hydroxylamine affects

Consider the following statements of Kupier (1949, 1951) and choose the correct answer:
1. A part of a huge cloud of dust and gas condensed to form primarily a proto-sun of low density surrounded by a rotating cloud disk
2. The proto-earth probably was a low-temperature body of gases and solids of about 500 times the earth's present mass
3. The accumulation of cold solid, the planetesimals, is the main process in the formation of primitive earth
4. The size of the planetesimals ranged in between the size of asteroids and that of dust particles

The reactions involved in translocation during protein synthesis include

According to the morphological and anatomical evidences of organic evolution, the similarity in the structure of the strobili of Lycopods and gymnosperms prove that

There are certain forms of species where males are altogether absent and females are produced by parthenogenesis which are always