This lesson describes the relationship between the specialised structural features of the mammalian gametes and their functions. The PowerPoint and accompanying resources have been designed to cover point 3.6 of the Pearson Edexcel A-level Biology A (Salters Nuffield) specification and includes descriptions of the acrosome in the head of the sperm and the zona pellucida in the egg
The lessons at the start of topic 3 (Voice of the genome) described the ultrastructure of eukaryotic cells, so this knowledge is referenced throughout the lesson and the students are challenged on their recall and understanding through a range of prior knowledge checks. For example, two of the exam-style questions that are included in the resources challenge the students to explain why a sperm cell is classified as an eukaryotic cell and to recognise the centrioles and the nucleus from structural descriptions. Along with the mitochondria, time is then taken to discuss and to describe the role of these organelles in relation to the function of the sperm cell. When considering the role of the haploid nucleus, links are made to the upcoming topic of meiosis and the events that contribute to variation. The importance of the enzymes that are found inside the acrosome is emphasised and this leads into the second half of the lesson where the layers surrouding the plasma membrane of the egg cell (corona radiata and zona pellucida) are examined
The final part of this lesson has been specifically planned to prepare the students for the next lesson in topic 3, where the acrosome reaction, cortical reaction and the fusion of nuclei that are involved in fertilisation are described
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A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.
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Topic 3: Voice of the Genome (Edexcel SNAB)
This bundle contains 13 detailed lesson PowerPoints, which together with their accompanying resources, have been planned to include a wide variety of tasks that will engage and motivate the students whilst covering the content of topic 3 of the Pearson Edexcel A-level Biology A (Salters Nuffield) specification. The voice of the genome topic content includes key biological concepts such as eukaryotic cells, cell division and genetics and the following specification points are covered by these lessons: * All living organisms are made of cells, sharing common features * The ultrastructure of eukaryotic cells and the role of the organelles * The role of the rER and the Golgi body in protein transport * The relationship between the features of the mammalian gametes and their functions * The loci is the location of a gene on a chromosome * The linkage of genes on a chromosome and sex linkage * The role of meiosis in ensuring genetic variation * The role of mitosis and the cell cycle * The meaning of the terms stem cell, pluripotency and totipotency * The decisions about the use of stem cells in medical therapies * The specialisation of cells through differential gene expression * Understand how the cells of multicellular organisms are organised into tissues, tissues into organs and organs into systems * Phenotype is the interaction between genotype and the environment * Epigenetic changes can modify the activation of certain genes * Some phenotypes are affected by multiple alleles for the same gene at many loci as well as the environment and this gives rise to continuous variation If you would like to sample the quality of lessons in this bundle, then download the ultrastructure of eukaryotic cells, mitosis and the cell cycle and gene expression lessons as these have been uploaded for free
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The ultrastructure of cells (Edexcel SNAB)
This lesson bundle contains 7 lessons which have been designed to cover the Pearson Edexcel A-level Biology A (Salters Nuffield) specification points which focus on the structure of eukaryotic and prokaryotic cells and the functions of their components. The lesson PowerPoints are highly detailed, and along with the accompanying worksheets, they have been planned at length to contain a wide range of engaging tasks which cover the following A-level Biology content found in topics 2, 3 and 4 of the course: 2.2 (i): Know the structure and function of cell membranes 3.1: Know that all living organisms are made of cells, sharing some common features 3.2: Know the ultrastructure of eukaryotic cells, including nucleus, nucleolus, ribosomes, rough and smooth endoplasmic reticulum, mitochondria, centrioles, lysosomes, and Golgi apparatus 3.3: Understand the role of the rough endoplasmic reticulum (rER) and the Golgi apparatus in protein transport within cells, including their role in the formation of extracellular enzymes 3.4: Know the ultrastructure of prokaryotic cells, including cell wall, capsule, plasmid, flagellum, pili, ribosomes, mesosomes and circular DNA 3.6: Understand how mammalian gametes are specialised for their functions (including the acrosome in sperm and the zona pellucida in the egg) 3.13: Understand how the cells of multicellular organisms are organised into tissues, tissues into organs and organs into systems 4.7: Know the ultrastructure of plant cells (cell walls, chloroplasts, amyloplasts, vacuole, tonoplast, plasmodesmata, pits and middle lamella) and be able to compare it with animal cells.
£8.00
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