(i) helicase – opens the helix (ii) topoisomerases – removes the supercoiling of DNA (iii) Primase: synthesises RNA primer (iv) Telomerase: to synthesises the DNA of telomeric end ofchromosomes.
(i) helicase – opens the helix
(ii) topoisomerases – removes the supercoiling of DNA
(iii) Primase: synthesises RNA primer
(iv) Telomerase: to synthesises the DNA of telomeric end ofchromosomes.
The triploid tissue in the ovule is the endosperm. Its triploid condition is attained due to the fusion of two polar nuclei and one nucleus of male gamete (also referred to as triple fusion).
The triploid tissue in the ovule is the endosperm. Its triploid condition is attained due to the fusion of two polar nuclei and one nucleus of male gamete (also referred to as triple fusion).
No, they are not necessary. Apomixis is actually an alternative to sexual reproduction although the female sexual apparatus is used in the process. In apomicts, embryos can develop directly from the nucellus or synergid or egg. Therefore, there is no need for either pollination or fertilisation.
No, they are not necessary. Apomixis is actually an alternative to sexual reproduction although the female sexual apparatus is used in the process. In apomicts, embryos can develop directly from the nucellus or synergid or egg. Therefore, there is no need for either pollination or fertilisation.
Name indicating their functions, a few additional enzymes, other than DNA polymerase and ligase, that are involved in the replication of DNA with high degree of processivity and accuracy.
(i) helicase – opens the helix (ii) topoisomerases – removes the supercoiling of DNA (iii) Primase: synthesises RNA primer (iv) Telomerase: to synthesises the DNA of telomeric end ofchromosomes.
(i) helicase – opens the helix
See less(ii) topoisomerases – removes the supercoiling of DNA
(iii) Primase: synthesises RNA primer
(iv) Telomerase: to synthesises the DNA of telomeric end ofchromosomes.
Which is the triploid tissue in a fertilised ovule? How is the triploid condition achieved?
The triploid tissue in the ovule is the endosperm. Its triploid condition is attained due to the fusion of two polar nuclei and one nucleus of male gamete (also referred to as triple fusion).
The triploid tissue in the ovule is the endosperm. Its triploid condition is attained due to the fusion of two polar nuclei and one nucleus of male gamete (also referred to as triple fusion).
See lessIs pollination and fertilisation necessary in apomixis? Give reasons.
No, they are not necessary. Apomixis is actually an alternative to sexual reproduction although the female sexual apparatus is used in the process. In apomicts, embryos can develop directly from the nucellus or synergid or egg. Therefore, there is no need for either pollination or fertilisation.
No, they are not necessary. Apomixis is actually an alternative to sexual reproduction although the female sexual apparatus is used in the process. In apomicts, embryos can develop directly from the nucellus or synergid or egg. Therefore, there is no need for either pollination or fertilisation.
See less