Traditional Breeding

Q.

Which of the following types of pollination lead to genetic variation?

1. Both B and C

2. Xenogamy

3. Geitonogamy

4. Autogamy

Q.

Briefly describe various steps involved in plant breeding.

Q. What do you understand by out cross?

Q. A farmer crosses the progeny of a cattle that produces superior progeny, for several generations so as to obtain higher yield. Will he be successful in his attempt? If not, how will he solve this problem? [3]

Q. Assertion [A]: DNA/transgenic technology is more advantageous than traditional cross breeding techniques.
Reason [R]: It is difficult to identify precise genes which improves plant quality in traditional breeding techniques.

1. Both A and R are true and R explains A
2. Both A and R are true but R does not explain A
3. A is true and R is false
4. A is true and R is false

Q. What are the limitations of cross breeding among selected parents in plant breeding programmes?

Q. Assertion [A]: DNA/transgenic technology is more advantageous than traditional cross breeding techniques.
Reason [R]: It is difficult to identify precise genes which improve plant quality in traditional breeding techniques.

1. Both A and R are true and R explains A
2. Both A and R are true but R does not explain A
3. A is true and R is false
4. A is true and R is false

Q. Assertion [A]: DNA/transgenic technology is more advantageous than traditional cross breeding techniques.
Reason [R]: It is difficult to identify precise genes which improve plant quality in traditional breeding techniques.

1. Both A and R are true and R explains A
2. Both A and R are true but R does not explain A
3. A is true and R is false
4. A is true and R is false

Q. Genetically modified crops can be produced by ___________.

1. Recombinant DNA technology
2. Somatic hybridisation
3. Cross breeding
4. Micropropagation

Q. Dolly sheep cloned by Dr. Ian Wilmut was genetically identical to

1. The sheep which donated haploid nucleus
2. The donor sheep which donated diploid nucleus
3. The sheep which donated the egg cell
4. The surrogate mother

Q.

why does geitonogamy leads to inbreeding depression?

Q. Which of the following is true for traditional cross breeding of crops?

1. Slow
2. Expensive
3. Harmful to environment
4. Random mutations

Q. Repeated self pollination over the generations produces.

1. Better progeny
2. Elimination of weak traits
3. New varieties
4. Weak progeny

Q.

Briefly describe various steps involved in plant breeding.

Q. Which of the following is true for traditional cross breeding of crops?

1. Slow
2. Expensive
3. Harmful to environment
4. Random mutations

Q. Transgenic plants take longer to develop when compared to plants being improved using traditional breeding

1. True
2. False

Q. Transgenic plants take longer to develop when compared to plants being improved using traditional breeding

1. True
2. False

Q. What is the significance or advantage of outcrossing?

Q. The earliest record of point mutation is

1. White eyed male Drosophila by Morgan
2. Short legged sheep by Seth Wright
3. Autotrophic mutants of Neurospora by Beadle and Tatum
4. Mutants of Escherichia coli discovered by Joshua Lederberg

Q. Assertion [A]: DNA/transgenic technology is more advantageous than traditional cross breeding techniques.
Reason [R]: It is difficult to identify precise genes which improves plant quality in traditional breeding techniques.

1. Both A and R are true and R explains A
2. Both A and R are true but R does not explain A
3. A is true and R is false
4. A is true and R is false

Q. In maize, hybrid vigor is exploited by

1. Harvesting seeds from the most productive plants
2. Inducing mutations
3. Bombarding the protoplast with DNA
4. Crossing of two inbreed parental lines