Meiosis: Sources of Genetic Variation Having genetically different offspring can be advantageous for natural selection Meiosis has several mechanisms that increase the genetic diversity of gametes ...
Identifying the Stages of Meiosis Cells undergoing meiosis can be observed and photographed using specialised microscopes The different stages of meiosis have distinctive characteristics meaning th...
Meiosis in Animal & Plant Cells Meiosis is a form of nuclear division that results in the production of haploid cells from diploid cells It produces gametes in plants and animals that are used ...
Homologous Chromosomes In diploid cells there are two complete sets of chromosomes in the nucleus Chromosomes have a characteristic shape They have a fixed length The position of the centromere is ...
Haploid & Diploid Cells A diploid cell is a cell that contains two complete sets of chromosomes (2n) These chromosomes contain the DNA necessary for protein synthesis and cell function Nearly a...
The Role of Gibberellin in Germination of Barley Gibberellins are a type of plant growth regulator involved in controlling seed germination and stem elongation When a barley seed is shed from the p...
The Role of Auxin in Elongation Growth Plant hormones (also known as plant growth regulators) are responsible for most communication within plants Auxins are a type of plant growth regulator that i...
Electrical Communication in the Venus Flytrap Plants possess communication systems that enable them to coordinate the different parts of their bodies The Venus flytrap is a carnivorous plant that g...
Sliding Filament Model of Muscular Contraction Structure of thick & thin filaments in a myofibril The thick filaments within a myofibril are made up of myosin molecules These are fibrous protei...
Ultrastructure of Striated Muscle Striated muscle makes up the muscles in the body that are attached to the skeleton Striated muscle is made up of muscle fibres A muscle fibre is a highly specialis...
Stimulating Contraction in Striated Muscle Striated muscle contracts when it receives an impulse from a motor neurone via the neuromuscular junction When an impulse travelling along the axon of a m...
Cholinergic Synapses Where two neurones meet, they do not actually come into physical contact with each other – a very small gap, known as the synaptic cleft, separates them The ends of the two neu...
