Sexual life cycles and meiosis
6 important questions on Sexual life cycles and meiosis
How does the three main types (Animals, plants and some algae, most fungi and some protists)of sexual life cycles differ?
- plant is diploid than with meiosis it is haploid than mitosis occur and they are haploid, then after fertilization they are diploid again and mitosis occur diploid.
- fungi zygote is diploid than meiosis occur and it is haploid, mitosis occur, and after fertilization the zygote is diploid.
What are the stages of Meiosis?
Meisosis II: sister chromatids separate.
Which stages has meiosis I?
metaphase I: pairs of homologous chromosomes are arranged at the metaphase plate.
anaphase I: homologs chromosomes move toward opposite poles.
telophase and cytokinesis I: two haploid cells form; each chromosome still consists of two sister chromatids.
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Which stages has meiosis II?
metaphase II: chromosomes are positioned at the metaphase
anaphase II: chromatid are separeted and move towards oppostite poles
telophase II and cytokines: nuclei forms (haploid daugther cells).
What causes genetic diversity?
reshuffling of alleles during sexual reporduction
Which three mechanisms contribute to genetic variation?
crossing over
random fertilization
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