Answer:
The delivery of the paternal genome to the egg is a primary goal of fertilization. In preparation for this step, the nucleus of the developing spermatozoon undergoes extensive morphological and biochemical transformations during spermatogenesis to yield a tightly compacted sperm nucleus. These modifications are essentially reversed during fertilization. As a result, the incorporated sperm nucleus undergoes many steps in the egg cytoplasm as it develops into a male pronucleus. The sperm nucleus (1) loses its nuclear envelope, (2) undergoes nucleoprotein remodeling, (3) decondenses and increases in size, (4) becomes more spherical, (5) acquires a new nuclear envelope, and (6) becomes functionally competent to synthesize DNA and RNA. These changes are coordinate with meiotic processing of the maternal chromatin, and often result in behaviors asynchronous with the maternal chromatin. For example, in eggs fertilized during meiosis, the sperm nucleus decondenses while the maternal chromatin remains condensed. A model is presented that suggests some reasons why this puzzling behavior exists. Defects in any of the processes attending male pronuclear development often result in infertility. New assisted reproductive technologies have been developed that ensure delivery of the sperm nucleus to the egg cytoplasm so that a healthy embryo is produced. An emerging challenge is to further characterize the molecular mechanisms that control sperm nuclear transformations and link these to causes of human infertility. Further understanding of this basic process promises to revolutionize our understanding of the mystery of the beginning of new life.
Explanation:
The delivery of the paternal genome to the egg is a primary goal of fertilization. In preparation for this step, the nucleus of the developing spermatozoon undergoes extensive morphological and biochemical transformations during spermatogenesis to yield a tightly compacted sperm nucleus. These modifications are essentially reversed during fertilization. As a result, the incorporated sperm nucleus undergoes many steps in the egg cytoplasm as it develops into a male pronucleus.
1. The correct answer is alcoholic fermentation.
Alcoholic fermentation, also known as ethanol fermentation, refers to a biological procedure that transforms sugars, like fructose, glucose, and sucrose into cellular energy, generating carbon dioxide and ethanol and the by-products.
2. A scientific theory refers to a well-substantiated illustration of certain features of the natural world, on the basis of the body of facts, which have been spontaneously confirmed via experiment and observation. Thus, the statement, that it has the same meaning in science as it does in daily life is incorrect.
3. The correct answer is mutualism.
Mutualism refers to a symbiotic association in which both the species benefit.
4. The correct answer is ATP.
ATP refers to the biochemical manner to use and store energy. It is in fact, utilized by every cell of the body as the source of energy, which maintains everything.
Answer:
Making more babies that will survive and having an adaption
Explanation:
DRN or data release number refers your unique 4 digit code on the FAFSA confirmation page and your student aid report
Answer:
it illustrated natural selection because the most favorable traits live longer than the unfavorable traits.
Explanation:
