Gentics And Evoloution - Study Mode

Show All Answers

[#166] The capability of nitrogen-fixation by certain bacteria has been traced to a set of genes, called the

(A) Recessive genes

(B) Complementary genes

(C) Lethal genes

(D) Nif genes

Correct Answer

(D) Nif genes

[#167] Match List-I with List-II and select the correct answer: List-I List-II a. Intravarietal hybridization 1. The plants of two different species belonging to the same genus are crossed together b. Intervarietal hybridization 2. The crosses are made between the plants belonging to two different genera c. Interspecific hybridization 3. The crosses are made between the plants of two different varieties of the same species d. Intergeneric hybridization 4. The crosses are made between the plants of the same variety

(A) a-3, b-2, c-4, d-1

(B) a-4, b-3, c-1, d-3

(C) a-2, b-1, c-4, d-3

(D) a-1, b-3, c-4, d-2

Correct Answer

(B) a-4, b-3, c-1, d-3

[#168] Assertion (A) DNA fingerprinting has become a powerful tool to establish paternity and identity of criminal in rape and assault cases. Reason (R) Trace evidences such as hair, saliva and dried semen are adequate for DNA analysis

(A) Both A and R are true and R is the correct explanation of A

(B) Both A and R are true, but R is not the correct explanation of A

(C) A is true, but R is false

(D) A is false, but R is true

Correct Answer

(A) Both A and R are true and R is the correct explanation of A

[#169] Usually, the greatest interference is between loci which are

(A) Very close to each other

(B) Very far from each other

(C) Placed in the same chromosome

(D) None of the above

Correct Answer

(A) Very close to each other

[#170] In case of less friable tissues, dispersion may be improved by modifying the nutrient medium in several ways which include

(A) Decreasing auxin concentration

(B) Altering the ratio of auxin and cytokinin

(C) Removing cell wall degrading enzymes

(D) All of the above

Correct Answer

(B) Altering the ratio of auxin and cytokinin