Question
Selection process after hybridisation is very crucial in breeding programmes. Give reason.
✓
Answer
This step consists of selection of plants among the progeny of the hybrids with desired combination of characters. It yields plants that are superior than both the parents. This is known as hybrid vigour/ heterosis. These are self-pollinated for several generations, till they reach a state of uniformity or homozygosity, so that the characters will not segregate in the progeny.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Mention the factors that regulate the rate of function of the entire pond.
What are linked genes? How can a pair of linked gene be identified?
Name and explain the two types of immune response in humans.
Study the given diagram and answer the asked questions :
(a) Write the name of human embryo stage as shown in diagram.
(b) Mention the name and function of ‘a’ labelled part.
(c) What happens to inner cell mass after implantation into uterus? Write.
(d) Where are stem cells in this embryo?
(a) Write the name of human embryo stage as shown in diagram.
(b) Mention the name and function of ‘a’ labelled part.
(c) What happens to inner cell mass after implantation into uterus? Write.
(d) Where are stem cells in this embryo?
Is it true that carpets and curtains/ drapes placed on the floor or wall surfaces can reduce noise level. Explain briefly?
- A short length of a DNA molecule contains 120 adenine and 120 cytosine bases. What is the total number of nucleotides in that DNA fragment?
- A DNA contains 20,000 base pairs. How many nucleotides would be present in it?
What is the role of integuments of ovule after fertilization? Which is the most common type of ovule found in angiosperms?
Explain over-exploitation.
“Snow leopards are not found in Kerala forests and tuna fish are rarely found beyond tropical latitude in the ocean”. Study the above two cases and state the possible reasons for the same.
'Introducing sex education in school is a good step for providing right information to adolescents'. In context to the statement given above, answer the questions that follow.
- Which part of the brain controls the sex urge?
- What are the necessary topics that should be taught in schools, in context of STDs and AIDS.