Definition of Linkage and Linked Genes

Q.

When synapsis is complete all along the chromosome, the cell is said to have entered a stage called

1. Diplotene

2. Pachytene

3. Diakinesis

4. Zygotene

Q.

What are genotypes?

Q. Select the correct statement from the ones given below with respect to dihybrid cross :

1. Tightly linked genes on the same chromosome show higher recombinations
2. Genes far apart on the same chromosome show very few recombinations
3. Genes loosely linked on the same chromosomes show similar recombinations as the tightly linked ones
4. Tightly linked genes on the same chromosome show very few recombination

Q.

Strength of linkage is related inversely to distance between

1. Genes

2. Chromatids

3. Chromosomes

4. Telomeres

Q.

How many traits are you looking at in a monohybrid cross?

Q. Crossing over results in separation of linked genes.

1. completely
2. incompletely
3. adjacent
4. tightly

Q. Greater the distance between the two genes on a chromosome, _________________.

Q. Distinguish b/t prophase of mitosis and prophase of meiosis

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.

Listthe main differences between mitosis and meiosis.

Q.

In mitosis, if the number of chromosomes are not actually doubled, how is the restoration of the no. of chromosomes possible in the daughter cells?

Q. mitosis anaphase differ from metaphase in possessing

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. If the four genes A, B, C and D are 5, 10 and 30 Map units away from each other respectively and arranged in the same manner in a chromosome, which two genes would likely show more recombination?