Sexual life cycles

Flagella have been lost in the vegetative phase of the diatom life cycle, but they are still present in male gametes of centric species, thereby representing a hallmark of sexual reproduction. This process, besides maintaining and creating new genetic diversity, in diatoms is also fundamental to restore the maximum cell size following its reduction during vegetative division. Nevertheless, sexual reproduction has been demonstrated in a limited number of diatom species, while our understanding of its different phases and of their genetic control is scarce.

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Lecture Principles of Biology - Chapter 13: Meiosis and Sexual Life Cycles. After completing this section, you will understand the knowledge about modes of reproduction, diploid/haploid and meiosis, meiosis I and meiosis II phases, key differences between mitosis and meiosis,...

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The impossibility of closing the life cycle of the European eel (Anguilla anguilla) in captivity troubles the future of this critically endangered species. In addition, the European eel is a highly valued and demanded resource, thus the successful closing of its life cycle would have a substantial economic and ecological impact.

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Chinese cordyceps, also known as Chinese caterpillar fungus (Ophiocordyceps sinensis, syn. Cordyceps sinensis), is of particular interest for its cryptic life cycle and economic and ecological importance. The large-scale artificial cultivation was succeeded recently after several decades of efforts and attempts.

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Chapter 13 - Meiosis and sexual life cycles. This chapter presents the following content: Somatic cell and gamete, autosome and sex chromosomes, haploid and diploid; describe the events that characterize each phase of meiosis; describe three events that occur during meiosis I but not mitosis; name and explain the three events that contribute to genetic variation in sexually reproducing organisms.

44p tradaviahe19 29-03-2021 11 1   Download

Chapter 15 - The chromosomal basis of inheritance. This chapter presents the following content: Mendelian inheritance has its physical basis in the behavior of chromosomes during sexual life cycles, morgan traced a gene to a specific chromosome, linked genes tend to be inherited together because they are located on the same chromosome,...

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This chapter distinguish between the following terms: somatic cell and gamete, autosome and sex chromosomes, haploid and diploid; describe the events that characterize each phase of meiosis; describe three events that occur during meiosis I but not mitosis; name and explain the three events that contribute to genetic variation in sexually reproducing organisms.

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In flowering plants a number of genes have been identified which control the transition from a vegetative to generative phase of life cycle. In bryophytes representing basal lineage of land plants, there is little data regarding the mechanisms that control this transition.

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This chapter distinguish between the following terms: somatic cell and gamete, autosome and sex chromosomes, haploid and diploid; describe the events that characterize each phase of meiosis; describe three events that occur during meiosis I but not mitosis; name and explain the three events that contribute to genetic variation in sexually reproducing organisms.

43p nomoney10 04-05-2017 45 3   Download

Chapter 13 - Meiosis and sexual life cycles. This chapter distinguish between the following terms: somatic cell and gamete, autosome and sex chromosomes, haploid and diploid; describe the events that characterize each phase of meiosis; describe three events that occur during meiosis I but not mitosis; name and explain the three events that contribute to genetic variation in sexually reproducing organisms.

53p tangtuy02 08-03-2016 58 3   Download

Sexual and reproductive health (SRH) was given an international consensus def- inition at the International Conference on Population and Development (ICPD) in 1994. At its core is the promotion of healthy, voluntary and safe sexual and reproductive choices for individuals and couples, including decisions on family size and timing of marriage, that are fundamental to human well-being. Sexual- ity and reproduction are vital aspects of personal identity and key to creating fulfilling personal and social relationships within diverse cultural contexts.

41p thankinhphanliet 21-12-2012 50 3   Download