Definition of Linkage and Linked Genes

Q.

What is importance of linkage?

Q.

Leaf color in Mirabilis jalapa is an example of

1. Non-Mendelian inheritance

2. Mendelian inheritance

3. Chemical inheritance

4. Both (b) and (c)

Q. The classification of linkage into complete and incomplete linkages are based on their relative .

1. linkage position
2. linkage strength
3. crossing over
4. linkage size

Q.

What does mendelian inheritance mean?

Q. Select the incorrect statement(s).
(a) Linked genes cause absolute lethality
(b) Persons affected by PKU do not show mental disorder
(c) $F_2$ ratio in codominance and incomplete dominance are same
(d) Sex of Drosophila is determined by XX-XO chromosomes

1. (a) and (b)
2. (b) and (c)
3. (a), (b) and (d)
4. All of these

Q. The classification of linkage into complete and incomplete linkages are based on their relative .

1. linkage position
2. linkage strength
3. crossing over
4. linkage size

Q. Genes which are present near each other on the same chromosome and thus tend to stay together are called genes.

1. recombinant
2. recessive
3. linked
4. associated

Q. The term "linkage" was coined by :

1. W. Sutton
2. T.H.Morgan
3. T. Boveri
4. G. Mendel

Q. Independent assortment of genes does not take place when:

1. Genes are located on homologous chromosomes
2. Genes are linked and located on the same chromosomes
3. Genes are located on non-homologous chromosome
4. All the above

Q.

Strength of linkage is indirectly proportional to

1. Distance between genes

2. Number of chromosomes in the organism

3. Synapsis

4. Chiasma formation

Q. Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, the $F_2$ segregation will show

1. Higher number of the parental types
2. Higher number of the recombinant types
3. Segregation in the expected 9 : 3 : 3 : 1 ratio
4. Segregation in 3 : 1 ratio

Q. Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, the $F_2$ segregation will show

1. Higher number of the parental types
2. Higher number of the recombinant types
3. Segregation in the expected 9 : 3 : 3 : 1 ratio
4. Segregation in 3 : 1 ratio

Q. Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridised then $F_2$- generation will show

1. Higher number of the recombinant types
2. Segregation is expected in 9 : 3 : 3: 1 rate
3. Segregation in 3: 1 ratio
4. Higher number of parental types

Q.

Linkage was discovered by ___.

1. Blakeslee

2. Sutton

3. Muller

4. Bateson & Punnett