beginning of meiosis? Use the terms chromosome number‚ haploid‚ and diploid in your answer. A: Cells in the begining of meiosis has diploid cells‚ with a full amount of chromosomes. In the end of meisos‚ the four genetically different daughter cells are haploid (gametes)‚ they have half the number of chromosomes. Because of this‚ they are able to fuse with other gametes (ex. egg and sperm) to form a zygote‚ which is a diploid cell with the full number of chromosomes. 2. What is the dignificance
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B1 Genes are found in our chromosomes and parents pass these on to offspring in their sex cells. Different versions of the same gene are called alleles‚ and these can determine features such as eye colour‚ and the inheritance of disorders such as cystic fibrosis. DNA You will remember from your Key Stage 3 studies that the nucleus controls the activities of a cell. The instructions for how an organism develops are found in the nuclei of its cells Chromosomes Chromosomes are structures found in
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REVISION FOR GENETICS EXAM 1. Make sure you KNOW and UNDERSTAND the following TERMS and DEFINITIONS: -DNA - diploid - genes - haploid - chromosomes - crossing over - sex cells - fertilisation - somatic cells - gamete - autosomes - zygote - sex chromosomes - phenotype - karyotype - genotype - eukaryotic cell division - dominant - mitosis - recessive - meiosis - homozygous - heterozygous - incomplete dominance - codominance - pure bred - hybrid
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Describe and evaluate the biological explanation of gender development. Give evidence in your answer. (10 marks) The biological approach states that human beings have evolved so that males and females possess different chromosomes that trigger the production of different levels of certain hormones. It is these hormonal differences between the sexes that lead to differences in behaviour. This allows for males and females to perform different roles in reproduction thus ensuring the survival of
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genetic information‚ a duplicate copy of DNA must be available. Before DNA replication occurs‚ each chromosome consists of a single long strand of DNA called a chromatid. When a diploid cell undergoes meiosis‚ four unique haploid daughter cells are produced. It is important for gametes to be haploid Experiment: Following Chromosomal DNA in Meiosis 2. Why was the model of ONE chromosome composed of TWO identical strands of beads at the beginning of the experiment? To represent the dna
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male reproductive cell interacts with the female reproductive cell those two cells start the process with the chromosomes for that new life. The genes that are developed from these chromosomes comprise the DNA‚ basically the map of the human being. All cells minus the male and female reproductive cells have 46 chromosomes and they have 23 in-order to keep the perfect balance of the chromosomes when combining the beginning. So how do children inherit specific traits from their parents? Everyone has
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during the G1/S stage where DNA is prepared for replication as the cell grows (G1) and then the actual replication (S) (Erster 25-26)‚ G2 where further growth and preparation for the chromosomes to separate occur (Erster 25-26)‚ and then anaphase where the replicated DNA is separated and considered at that point a chromosome (Erster 17‚ 26). These processes are essential for the prevention of the formation of cancerous tumors which can occur if regulation stops (Erster 37). Choice A) A is true. A spindle
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Mitosis in a nutshell is the process of splitting the nucleus and it occurs hand in hand with the rest of the cell cycle and cytokenesis. Meiosis‚ on the other hand‚ is a process of taking a diploid cell (a cell with the full number of chromosomes) and producing haploid gametes
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development‚ reproduction‚ energy processing‚ and regulation. DNA allows for the properties of life to be maintained and passed from generation to generation Eukaryotic chromosomes are made of chromatin. Chromatin is the complex of DNA and associated proteins that maintaining structure for gene activity and replication. Each single chromosome contains one very long DNA molecule that carries several hundred to a few thousand genes‚ the units that specify an organism’s inherited traits. Cell Cycle: Interphase
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Meiosis and mitosis are both types of cell division. Cell division is the reproduction of cells‚ and requires the duplication of chromosomes. Mitosis takes place when the nucleus divides. Meiosis is a type of cell division that produces haploid gametes in diploid organisms. Mitosis and meiosis are two very different processes. While meiosis only requires the cell to divide twice‚ the cell only divides once during mitosis. This causes meiosis to produce four cells and mitosis to produce two cells
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