Gentics And Evoloution - Study Mode

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[#366] 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

(A) 1, 3 and 4 are true

(B) 1 and 4 are true

(C) 1, 2 and 4 are true

(D) 2 and 3 are true

Correct Answer

(C) 1, 2 and 4 are true

[#367] 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

(A) Only 1, 2 and 4 are true

(B) Only 3 and 4 are true

(C) Only 2, 3 and 4 life true

(D) Only 1, 2 and 3 are true

Correct Answer

(D) Only 1, 2 and 3 are true

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

(A) Gene mutation

(B) Chromosomal mutation

(C) Genetic recombination

(D) Genetic drift

Correct Answer

(A) Gene mutation

[#369] Barr body is absent in somatic cell of

(A) Klinefelter syndrome individual

(B) Tripple X syndrome individual

(C) Turner syndrome individual

(D) Sub-human mammalian female individual

Correct Answer

(C) Turner syndrome individual

[#370] The first attempt to grow angiosperm embryos in vitro under aseptic conditions was made by

(A) Haberlandt (1910)

(B) Hannig (1904)

(C) Abraham (1960)

(D) Muir (1953)

Correct Answer

(B) Hannig (1904)