CIE A Level Biology复习笔记16.2.1 Key Terms in Genetics
Key Terms in Genetics Genes & alleles The DNA contained within chromosomes is essential for cell survival Every chromosome consists of a long DNA molecule which codes for several different prot...
CIE A Level Biology复习笔记16.1.5 Meiosis: Sources of Genetic Variation
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 ...
CIE A Level Biology复习笔记16.1.4 Identifying the Stages of Meiosis
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...
CIE A Level Biology复习笔记16.1.3 Meiosis in Animal & Plant Cells
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 ...
CIE A Level Biology复习笔记16.1.2 Homologous Chromosomes
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 ...
CIE A Level Biology复习笔记16.1.1 Haploidy & Diploidy
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...
CIE A Level Biology复习笔记15.2.3 The Role of Gibberellin in Germination of Barley
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...
CIE A Level Biology复习笔记15.2.2 The Role of Auxin in Elongation Growth
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...
CIE A Level Biology复习笔记15.2.1 Electrical Communication in the Venus Flytrap
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...
