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

Genes G S L H are located on same chromosome. The recombination percentage is between L and G is 15%, S and L is 50%, H and S are 20%. The correct order of genes is _____.

(a)

GHSL

(b)

SHGL

(c)

SGHL

(d)

HSLG

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

T. H. Morgan

(1)

Sex linkage in Drosophila

Hugo de Vries

(2)

2n - 2

Monosomy

(3)

2n + 2

Nullisomy

(4)

Mutation theory

Tetrasomy

(5)

2n - 1

When two different genes came from same parent they tend to remain together.
i) What is the name of this phenomenon?
ii) Draw the cross with suitable example.
iii) Write the observed phenotypic ratio.

If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F₁ hybrid. Now you cross F₁ male with double recessive female.
i) What type of linkage is seen?
ii) Draw the cross with correct genotype.
iii) What is the possible genotype in F₂ generation?

What is the difference between missense and nonsense mutation?

Define linkage. Mention its types.

Mention the major stages involved in crossing over.

What is meant by synaptonemal complex?

Define terminalization.

Point out any four physical mutagens

What are deficiency loops?

Write the salient features of Sutton and Boveri concept.

Explain the mechanism of crossing over.

What are the three types of synapsis? (or) Give the types of Synapsis.

Classify cross over.

What is gene mapping? Write its uses

Draw the diagram of different types of aneuploidy.