Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Question
Chapter 37.1, Problem 2R
Summary Introduction
To review:
To compare the structure of pollen grain and mature embryo sac and its importance.
Introduction:
The formation of the pollen grain occurs by the division of pollen mother cell. The pollen mother cell further undergoes meiosis to form four haploid microspores. This microspore undergoes microsporogenesis to form mature pollen grain. The megaspore mother cell division leads to the formation of eight-nuclei and seven-celled mature embryo sac.
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What are the respective ploidies of gamete, zygote and somatic cells in a species with gametic meiosis?
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- How many chromosomes does a human normal haploid cell have? How many chromosomes does a human normal diploid cell have? How many are thesex chromosomes within each of them?arrow_forwardDuring which meiosis division does ploidy reduction occur? Does ploidy reduction occur in mitosis?arrow_forwardWhat are zygotes and other cells carrying two matching sets of chromosomes?arrow_forward
- How does the role of meiosis in gamete production differ between organisms with a diploid-dominant life cycle and organisms with an alternation of generations life cycle?arrow_forwardHow are haploid and diploid cells different?arrow_forwardAt what stage of mitosis can the kind and number of chromosomes be easily detected and determined? How does non disjunction in meiosis lead to numerical chromosomal aberration? If cell division during gametogenesis is non meoitic, what is its consequence to the future generations of diploid organisms? What is the relationship between meiosis and fertilization?arrow_forward
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