⁣An allele is one of two or more versions of DNA sequence (a single base or a segment of bases) at a given genomic location. ⁣The most common interaction between alleles is a dominant/recessive relationship. An allele of a gene is said to be dominant when it effectively overrules the other (recessive) allele. Eye colour and blood groups are both examples of dominant/recessive gene relationships.

⁣The life of an organization is made out of several levels that majorly include organ, tissue, cellular, chemical, organ system, and organism level.

⁣The central nervous system (CNS) is made up of the brain and spinal cord. It is one of 2 parts of the nervous system. The other part is the peripheral nervous system, which consists of nerves that connect the brain and spinal cord to the rest of the body. The central nervous system is the body's processing centre.

Excretion in animals

Reproduction in humans

Cell structure and organisation

Cell structure and organisation

B2- Inheritance of sex

A real cl****room Biology lesson on the topic of Photosynthesis. British Private Schooling in a Real TV Studio. Part of the SmartLearn Private School at Home series.

GCSE Additional Science Biology Respiration

What is Genetic Engineering- - Definition and Examples -

The cl****ification system organises species into domain, kingdom, phylum, cl****, order, family, genus and finally species.
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<br>‘Kingdom is the second highest rank below the rank of domain in this sequence of cl****ification. It helps us to group, or cl****ify, species into different families so we can see how closely or not they are related.
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<br>Cl****ification attempts to impose a hierarchy on the complex and dynamic variety of life on Earth by describing how different species group together, and how related they are to one another or not.
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<br>There are 5 kingdoms: animals, plants, fungi, prokaryotes and protoctists. Each kingdom has chareristic features so that an organism can easily be ****igned to one of the kingdoms.
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<br>Animals are eukaryotic, multicellular and have no cell walls. They develop from a blastocyst (which is part of embryo development). They have both nervous and hormonal control systems. They are heterotrophic which means they eat stuff and have a digestive system. They are motile which means they move. Cell division, which enables growth, happens in tissues.
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<br>Plants are eukaryotic, and multicellular like animals. However, unlike animals they have cell walls, with cellulose in. They are autotrophic, which means they use photosynthesis to make their own energy from sunlight. Their growth is restricted to meristems - which is layers of dividing cells. They are non-motile, have a leaf gas exchange system and are waterproofed.
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<br>The Fungi kingdom are eukaryotes and can be multicellular like animals and plants but can also be unicellular such as yeast. They have cell walls like plants but have a substance called chitin rather than cellulose. They are heterotrophic and saprotrophic meaning they decompose - so they break things down, or are parasitic. The body of a fungus is composed of thin filaments called hyphae. And they secrete enzymes, do external digestion and then absorb the resulting nutrients.
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<br>The Protoctista kingdom are eukaryotes like animals and plants. They can be unicellular and multicellular, like the fungi. They have cell walls, sometimes with polysaccharides. They are autotrophic and heterotrophic.
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<br>The prokaryotes are unicellular, they lack the organelles that are seen in eukaryotes. They are typically really small: about 10μm in size. Much too small to see with the human eye. They have cell walls and they are autotrophic, using photosynthesis and chemosynthesis (without light) and they are heterotrophic. They divide by binary fission, not by mitosis.
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<br>So from this video you should know that Kingdoms break down into 5 groups (Prokaryotae, Protoctista, Fungi, Plantae Animalia), based upon different chareristics including whether they have cell walls, are eukaryotic or prokaryotic, and how they get nutrition.
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Plant and Animal Cells - GCSE Biology Revision - SCIENCE WITH HAZEL<br />Need new clothes ? http://ahshirts.com<br />Need new clothes ? http://ahshirts.com

GCSE Biology - Aerobic & Anaerobic Respiration

GCSE Biology module (sample): DNA and genes <br /><br />By the end of this topic you will have covered: <br />- DNA, genes and genetic code <br />- Genetic modification <br /><br />Get the grades you need in GCSE Biology - access HD-quality GCSE revision videos and apps from LearnersCloud: <br />http://www.learnerscloud.com/s....tudent/products/gcse <br /><br />To find out more and to start a free trial visit: <br />http://www.learnerscloud.com/s....tudent/home/gcse/gcs

GCSE Biology module (sample): Nerves and hormones <br /><br />By the end of this topic you will have covered: <br />- Hormones in our body <br />- Tropisms: hormone control and plant growth <br />- Uses of plant hormones <br />- The nervous system <br />- The reflex arc <br />- The synapse <br />- The brain and mind <br />- Hormone control of the menstrual cycle <br />- Controlling fertility <br /><br />Get the grades you need in GCSE Biology; access HD-quality GCSE revision videos and apps from LearnersCloud: <br />http://www.learnerscloud.com/s....tudent/products/gcse <br /><br />To find out more and to start a free trial visit: <br />http://www.learnerscloud.com/s....tudent/home/gcse/gcs

GCSE Biology module (sample): Proteins and Enzymes <br /><br />By the end of this topic you will have covered: <br />- Proteins <br />- How proteins are made <br />- Enzymes <br /><br />Get the grades you need in GCSE Biology; access HD-quality GCSE revision videos and apps from LearnersCloud: <br />http://www.learnerscloud.com/s....tudent/products/gcse <br /><br />To find out more and to start a free trial visit: <br />http://www.learnerscloud.com/s....tudent/home/gcse/gcs

GCSE Biology module (sample): Tissues, organs and organ systems <br /><br />By the end of this topic you will have covered: <br />- Cells, tissues organs and organ systems <br />- Blood and circulatory system <br />- Gas exchange and the lungs <br />- Digestive system and digestive enzymes <br />- The Kidney and water balance <br />- The skeleton and the joints <br />- The effects of exercise on the body <br /><br />Get the grades you need in GCSE Biology; access HD GCSE revision videos and apps from LearnersCloud: <br />http://www.learnerscloud.com/s....tudent/products/gcse <br /><br />To find out more and to start a free trial visit: <br />http://www.learnerscloud.com/s....tudent/home/gcse/gcs

⁣The food you eat takes an incredible journey through your body, from top (your mouth) to bottom (your anus). Along the way the beneficial parts of your food are absorbed, giving you energy and nutrients.

⁣The lymphatic system is a network of delicate tubes throughout the body. It drains fluid (called lymph) that has leaked from the blood vessels into the tissues and empties it back into the bloodstream via the lymph nodes. The main roles of the lymphatic system include: managing the fluid levels in the body.