What Is Genetic Recombination

Q. What will be the distance between the two genes if their recombination frequency is 15%?

1. 10 centimorgan
2. 15 centimorgan
3. 20 centimorgan
4. 40 map unit

Q.

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by

1. Sutton Boveri

2. H. Morgan

3. Gregor J. Mendel

4. Alfred Sturtevant

Q. In Drosophila melanogaster; the genes white and yellow shows ____a____ recombination and genes white and miniature wing shows _____b_____ linkage.

1. $a-98.7\text{\%},b-37.2\text{\%}$
2. $a-98.7\text{\%},b-62.8\text{\%}$
3. $a-1.3\text{\%},b-37.2\text{\%}$
4. $a-1.3\text{\%},b-62.8\text{\%}$

Q. If a person wants to calculate the map distance of genes on chromosomes then he should have

1. total number of cross overs between the chromosomes
2. total number of genes on the chromosome
3. recombination frequency between the genes
4. order of the genes on the chromosome

Q.

What is the significance of chromosome Mapping?

Q. The recombination frequency (expressed as percentage) between X & Y is 4%, X & Z is 16%, Y & Z is 20%. Based on the recombination frequency, arrange the genes on the chromosome.

1. XYZ
2. XZY
3. YZX
4. YXZ

Q. Chromosomal theory of inheritance is a combination of:

1. knowledge of chromosomal segregation with Mendelian principles
2. knowledge of dihybrid cross with movement of chromosomes
3. knowledge of the Law of dominance with chromosomal appearance
4. knowledge of classical genetics with modern molecular biology

Q. In chromosome mapping, one map unit represents

1. 10% crossing over between two sites on a chromosome
2. 1% of the length of the chromosome
3. 1% crossing over between two sites on a chromosome
4. the distance between one gene and the next on a chromosome

Q. If the distance between five genes P, Q, R, S and T are 30 cM, 20 cM, 5 cM and 50 cM respectively, which two genes are likely to go along in the inheritance with the highest chance of co-occurrence?

1. Gene P and Q
2. Gene Q and R
3. Gene S and T
4. Gene R and S

Q. Who used in frequency of recombination between gene pairs on the same chromosome as a measure of distance between genes and mapped their position on chromosome.

1. Alfred Sturtevant
2. Gregor Mendel
3. Correns
4. Tschermak
5. Watson and Crick

Q. Chromosome maps/ genetic maps were first prepared by _________________.

1. Morgan (1910)
2. Sturtevant (1911)
3. Sutton and Boveri (1902)
4. Bateson and Punnett (1906)

Q. Who had proposed the chromosomal theory of the inheritance?

Q. The number of base pairs in each turn of Z-DNA and B-DNA helices respectively is

1. 9 and 11
2. 12 and 10
3. 10 and 13
4. 12 and 11

Q. Recombination frequency between gene A and B is 10 % and between B and C is 20 % .Find the frequency between A and B.

Q. If two genes are showing 50% recombinant frequency then which of the following statements is incorrect?

1. The genes may be on different chromosomes
2. Genes are tightly linked
3. Genes shows independent assortment
4. If the genes are present on the same chromosome, they undergo more than one crossover in every meiosis

Q. discuss suton and boveri by making a comparison between the behaviour of chromosome asn genes during meiosis to explain mendals law

Q.

Name the Scientists who first constructed recombinant DNA.

Q. what is the criteria used for mapping the genes by alfred sturtevant ?what is its use ?

Q. A normal chromosome and a rearranged chromosome is shown by the diagram. Which of the following describes this rearrangement?

1. Deletion
2. Duplication
3. Non-disjunction
4. Inversion
5. Translocation

Q. The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by?

1. T.H. Morgan
2. Gregor J. Mendel
3. Alfred Sturtevant
4. Sutton Boveri

Q. The frequency of recombination between genes present on the same chromosome as a measure of the distance between genes was explained by:

1. Sutton Boveri
2. T. H. Morgan
3. Gregor J.Mendel
4. Alfred Sturtevant

Q. The frequency of recombination between genes present on the same chromosome as a measure of the distance between genes was explained by:

1. Sutton Boveri
2. T. H. Morgan
3. Gregor J.Mendel
4. Alfred Sturtevant

Q. The frequency of recombination between genes present on the same chromosome as a measure of the distance between genes was explained by:

1. Sutton Boveri
2. T. H. Morgan
3. Gregor J.Mendel
4. Alfred Sturtevant