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Share buttons are a little bit lower. Published by Katherine Hancock Modified over 3 years ago. Summarize the events that occur during meiosis. Section 1 Meiosis Objectives: Relate crossing-over, independent assortment, and random fertilization to genetic variation. Compare spermatogenesis and oogenesis.
When the reproductive cells unite in fertilization, the normal diploid number is restored. Meiosis I During Meiosis I, homologous chromosomes separate. Crossing-over during prophase I results in the exchange of genetic material between homologous chromosomes.
As a result of meiosis, four haploid cells are produced from one diploid cell.
Crossing Over and Random Fertilization Both crossing-over and the random fertilization of gametes contribute to genetic variation in sexually reproducing organisms.
Importance of Genetic Variation Genetic variation is essential for evolution to occur. Meiosis in Females In sexually reproducing eukaryotic organisms, gametes form through the process of oogenesis in females.
Section 2 Sexual Reproduction Objectives: Differentiate between asexual and sexual reproduction. Identify three types of asexual reproduction. Evaluate the relative genetic and evolutionary advantages and disadvantages of asexual and sexual reproduction.
Differentiate between the three major sexual life cycles found in eukaryotes. The offspring are genetically identical to the parent. Sexual Reproduction Sexual reproduction is the formation of offspring through the union of gametes from two parents.
The offspring are genetically different from their parents. Types of Asexual Reproduction There are many types of asexual reproduction such as fission, fragmentation, and budding. All types lead to clones of the parent. This lack of diversity is a disadvantage in a changing environment.
Diploid Life Cycle In the diploid life cycle, the adults are diploid and the diploid individual occupies the major portion of the life cycle. Alternation of Generations Some organisms have a life cycle Sexual reproduction and meiosis section 2 alternates between diploid and haploid phases.
Chapter 13 Meiosis and Sexual Life Cycles. Meiosis and Sexual Reproduction. Chapter 10 Meiosis and Sexual Reproduction. All sexually reproducing organisms have pairs of chromosomes.
Chapter 5 Section 2- Sexual Reproduction A. Sexual Reproduction- two sex cellsB. Meiosis- a process that produces haploid sex cells and ensures that.
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