The process of cellular division by which gametes are formed is called Meiosis. The process occurs in specialized cells of the body called the germline cells, where gametes with half the normal chromosomes number (haploid) are produces. During fertilization the gametes each with haploid number combine to form a diploid zygote.
Answer:
d. occur in the same place, the cytoplasm
Pyruvate dehydrogenase is inactive<span> when the ratio (ATP/ADP) are high. Phosphorylation of PDH is mediated by a special regulatory eznyme, pyruvate dehydrogenase kinase. This enzyme is part of the PDH multienzyme complex. Phosphorylation inactivates pyruvate dehydrogenase. The kinase is, in turn, subject to allosteric activation by NADH and acetyl-CoA, while it is inhibited by ADP, NAD+ and by free coenzyme A. When the ratio of ATP/ADP increases, pyruvate dehydrogenase kinase is activated which then inactivates PDH. </span>
Answer:
The correct answer will be-
1. Homologous recombination- crossing over
2. Occur-during pachytene of meiosis I of gamete formation.
Explanation:
The basis of diversity of organism present on earth lies in the sexual mode of reproduction possessed by the organism to produce offspring. The sex cells involved in the reproduction are formed by a process called meiosis.
During the formation of gametes, at the pachytene stage of meiosis I take place a mechanistically conserved process which leads to the exchange of DNA segment between non-sister chromatids called crossing over through a process known as homologous recombination.
This exchange of genetic material in the homologous chromosomes increase the genetic diversity of the organism on the earth.