Name the scientist(s) who rediscovered the Mendelian work?
(i) Hugo de Vries
(ii) Carl Correns
(iii) Tschermak
(iv) T.H. Morgan

(a)

i and iv

(b)

i, ii and iv

(c)

i, ii and iii

(d)

ii, iii and iv

Which is not a feature of the chromosomal theory of inheritance?

(a)

Somatic cells of organisms are derived from zygote by repeated meiosis.

(b)

Chromosomes retain their structural uniqueness throughout the life of an organism.

(c)

Mendelian factors are located in chromosomes

(d)

Sutton and Boveri independently proposed the theory.

The following sequence represents the location of genes in a chromosome. A - B - C - M - R - S - y -Z. Which of the gene pairs will have least chance of getting inherited together?

(a)

A and M

(b)

Sand Y

(c)

M and Z

(d)

A and Y

Number of chromosomes (2n) in Ophioglossum is _________

(a)

1226

(b)

1622

(c)

1262

(d)

2126

Identify the syntenic gene from the given genes sequence of a chromosome G-H-I-J-K-L-M-A-B

(a)

G and H

(b)

J, K and L

(c)

G and B

(d)

AandB

Incomplete linkage was reported by Hutchinson in ___________

(a)

Drosophila

(b)

Maize

(c)

Neurospora

(d)

Lathyrus odoratus

Mechanism of crossing over involves the following stages. Select the correct sequence.

(a)

Tetrad stage ~ Synapsis ~ Bivalent stage ~ cross over

(b)

Syndesis ~ Tetrad ~ Crossing over ~ Terminalisation

(c)

Terminalisation ~ Tetrad ~ Bivalent ~ Cross over

(d)

Cross over ~ Bivalent ~ Tetrad ~ Terminalisation

During cross over, chiasma occurs between

(a)

Sister chromatids of non-homologous chromosomes

(b)

Non-sister chromatids of non- homologous chromosomes

(c)

Non-sister chromatids of homologous chromosomes

(d)

Sister chromatids of homologous chromosomes

At which stage of meiosis, does the chromosomes undergo recombination process

(a)

Leptotene stage of prophase I

(b)

Zygotene stage of prophase I

(c)

Diplotene stage of prophase I

(d)

Pachytene stage of prophase I

Which of the following statement(s) is/are wrong with respect to Recombination process?
(i) Mitotic crossing over occurs rarely in somatic cells.
(ii) Syndesis refers to pairing of non-homologous chromosome.
(iii) Procentric synapsis starts from telomeres.
(iv) A Bivalent has four chromatids.

(a)

i and iv

(b)

ii and i

(c)

ii and iii

(d)

All the above

Recombination frequency (RF) is equal to

(a)

\(\frac { No.ofoffsprings }{ No.ofrecombinants } \times 100\)

(b)

\(\frac { No.of\ recombinants }{ No.ofparentalstrains } \times 100\)

(c)

\(\frac { No.ofrecombinants }{ No.ofoffsprings } \times 100\)

(d)

\(\frac { No.ofoffsprings }{ No.ofparentalstrains } \times 100\)

In a population of 250 progenies produced, only 120 resemble the parental forms. Calculate the recombinant frequency.

(a)

66%

(b)

52%

(c)

59%

(d)

49%

Mutation theory was proposed by____________

(a)

T. H. Morgan

(b)

Hugo de Vries

(c)

Alfred Sturtevant

(d)

Sutton and Boveri

Identify the mutant variety of castor.

(a)

Sharbathi Sonora variety

(b)

Aruna variety

(c)

Reimei variety

(d)

Erectiferm variety

Which is not a non-ionizing radiation?

(a)

X-rays

(b)

Gamma rays

(c)

Alpha rays

(d)

UV rays