Match each item in COLUMN I with one in COLUMN II and select your answer from the codes given:

COLUMN I	COLUMN II
SCIENTIST	CONTRIBUTION
Francis Crick	a. Breaking the genetic code
Nirenberg	b. Eastablished Coenorthabditis elegans as as a model genetics  study organism
Benzer	c. Central dogma of molecular biology
Brenner	d. Bacteriophase genetics

	A	B	C	D
(1)	c	a	d	b
(2)	c	a	B	d
(3)	a	b	c	d
(4)	a	c	d	B

 

 

Identify the incorrect statement regarding experiments on Pisum sativum by Gregor Mendel?

(1) He conducted hybridisation experiments on garden peas for seven years (1856-1863) and proposed the laws of inheritance in living organisms.

(2) It was for the first time that statical analysis and mathematical logic were applied to problems in biology.

(3) Unfortunately his experiments had a small sampling size, which gave less credibility to the data that he collected.

(4) He investigated characters in the garden pea plant that were manifested as two opposing traits. 

Which of the following is a recessive trait for a character choosen by Mendel in garden pea?

(1) Violet flower color

(2) Yellow pod color

(3) Axial flower position

(4) tall stem height

Genes which code for a pair of contrasting traits or slightly different forms of the same gene are known as

1. Alleles
2. Loci
3. Cistrons
4. Introns

Indentify the incorrect statement:

(1) Tall plant produces gametes by meiosis and the dwarf plant by mitosis

(2) Only one allele is transmitted to a gamete.

(3) This segregation of alleles is a random process.

(4) Gametes will always be pure for the trait.

The law of Segregation is based on the fact that

(1) The Alleles do not show any blending

(2) There is random fertilization

(3) Gametes are pure for the trait

(4) The zygotes are diploid

The ultimate source of allelic variation is:

(1) Recombination

(2) Natural selection

(3) Mutation

(4) Drift

In the case of co-dominance, the F₁ generation resembles:

(1) Dominant parent

(2) Recessive parent

(3) Both the parents

(4) None of the parents

What can be the possible blood groups of progeny whose father and mother are of A and B group respectively?

(1) A and B only

(2) AB only

(3) All except O

(4) A, B, AB and O

In case of starch synthesis in pea seeds [controlled by B gene], BB homozygotes produce large and round starch grains; bb homozygotes produce smaller and wrinkled starch grains and Heterozygotes produce round seeds of intermediate size. What can be inferred from this observation?

(1) The gene B mutates at a faster rate.

(2) The gene B is easily influenced by the environment

(3) Dominance is not an autonomous feature of a gene or the product that it has information for

(4) Some genes do not follow the law of segregation.