Question

Question 1 (1 point) Saved Which of these processes must precede fertilization? a) oxidation O b) respiration Oc) mitosis Od) meiosis O e) mutation Question 2 (1 point) Which of the following diseases is not hereditary? O a) sickle-cell anemia O b ) cystic fibrosis c) diabetes d) arthritis O e) none of the above

Answer 1

Answers:

1. Process of fertilisation must be preceded by meiosis which results in formation of gametes from germ cells, i.e., spermatogonium and oogonium.

So, correct answer is (D).

2. Correct answer is (D),i.e., arthritis is not hereditary disease, rather it is an autoimmune disorder. Diabetes insipidus caused by insulin receptors insensitivity can be a hereditary disease.

3. Correct answer is (A). Mendal was the poineer in the field of genetics with his famous experiments on pea plants.

4. Correct answer is (A), i.e., no such inference can be derived from works of mendal that all organisms have same genetic code. All the other characteristics were stated by mendal, i.e., dominant and recessive traits, units of inheritance and parent's equal contribution to offspring genotypes.

5. Correct answer is (B), i.e., the geometry of an individual base pairs allows a base to form hydrogen bonding with its complementary base only.

6. A gene is defined as a particular stretch of DNA present on a chromosome that codes for a particular peptide. So, the answer is (A).

7. The correct answer is (C). Mutation is caused by any kind of alteration in the gene or the segment of DNA. So, if the DNA in egg or sperm is altered due to some reason, it will lead to mutation.

8. Children are so closely resembled to their parents because their genotype is the combination of DNA from both the parents that is one set of chromosome is herited from father and another one from mother. So, correct answer is (C).

9. Mutations are the result of rearrangement of base pairs in DNA or RNA, i.e., nucleic acids. So, answer can be (b) or (d).

10. The correct answer is option (E), i.e., all the above characteristics were studied by Gregor Mendal. Mendal studied 7 characters , plant height, seed colour, seed shape, pod colour, flower position, flower colour, and pod shape. 2nd Mendal studied hybrids, crosse monohybrid, dihybrid and trihybrid cross.