The A and B genes are 10 cm apart on a chromosome. If an AB/ab heterozygote is testcrossed to ab/ab, how many of each progeny class would you expect out of 100 total progeny?

(a)

25 AB, 25 ab, 25 Ab, 25 aB

(b)

10 AB, 10 ab

(c)

45 AB, 45 ab

(d)

45 AB, 45 ab, 5 Ab, 5aB

Which of the following sentences are correct?
1. The offspring exhibit only parental combinations due to incomplete linkage
2. The linked genes exhibit some crossing over in complete linkage
3. The separation of two linked genes are possible in incomplete linkage
4. Crossing over is absent in complete linkage

(a)

1 and 2

(b)

2 and 3

(c)

3 and 4

(d)

1 and 4

Due to incomplete linkage in maize, the ratio of parental and recombinants are ______.

(a)

50:50

(b)

7:1:1:7

(c)

96.4: 3.6

(d)

1:7:7:1

Changing the codon AGC to AGA represents _______.

(a)

missense mutation

(b)

nonsense mutation

(c)

frameshift mutation

(d)

deletion mutation

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.

Incomplete linkage was reported by Hutchinson in ___________

(a)

Drosophila

(b)

Maize

(c)

Neurospora

(d)

Lathyrus odoratus

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

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

Statement 1: Pairing of homologous chromosome is called as syndesis.
Statement 2: Proterminal synapsis occurs from telomeres.

(a)

Statement 1 is correct and Statement 2 is incorrect

(b)

Statement 1 is incorrect and Statement 2 is correct

(c)

Both the statements are correct

(d)

Both the statements are incorrect

Assertion (A): Self-sterility is observed in Nicotiana species.
Reason (R): Because the genes are located on chromosome.

(a)

A is true R is false

(b)

Both A and R are false

(c)

A is true, R is not correct explanation for A

(d)

R explains A