The reason why vegetatively reproducing crop
plants are best suited for maintaining hybrid
vigour is that
(a) once a desired hybrid has been produced
there are few chances of losing it
(b) they have a longer life span
(c) they are more resistant to diseases
(d) they can be easily propagated
Answers
Answer:
a) once a desired hybrid has been produced tjere are few chances of losing it
Explanation:
The Hybrid Vigour is best maintained in vegetative reproducing plants as because they are little liable to loss vigour due to absence of the sexual reproduction. In case of the vegetative reproduction, a new plant body can be developed from a part of old plant body.
Answer:
Heterosis is also called as hybrid vigor. It is the increase in characteristics as, size, growth rate, fertility, and yield of a hybrid organism over those of its parents. Plant and animal breeders exploit heterosis by mating two different pure-bred lines that have certain desirable traits. The first-generation offspring generally show, in greater measure, the desired characteristics of both parents. This vigor may decrease, however, if the hybrids are mated together; so the parental lines must be maintained and crossed for each new crop or group desired. Vegetative reproduction does not involve meiosis, hence no recombination and no loss of heterozygosity.