Files included (3). deronlinecasino.de; B1-You-and-Your-Genes-revision- deronlinecasino.de B1_what_you_should_know_bookletdocx. 5 a day revision B1 – You and your genes Genes and variation How many chromosomes are found in sex cells? Why is this important? What is a mutation?. This site contains PowerPoint slideshows and resources for the OCR 21st Century course, useful for revision, This page contains PowerPoints for the NEW OCR 21st Century () GCSE course. Biology 1 - You and your genes. Use this slideshow to help you teach the new OCR 21st Century B1 unit. 21st Century Science B1 Revision PowerPoint. 42 customer reviews. jpchampy Files included (1). B1 Revision – You and Your deronlinecasino.de You and Your GenesModule B1. This PowerPoint explains everything you need to know about Biology Module 1 according to OCR 21st.
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B1 Revision — You and Your Genes. What makes us all different?. Download Policy: While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. Organisms inherit information from their parents.
This controls how they develop, so children look a lot like their parents. People share many common features and the differences between people are very small. These differences make us unique. Different proteins in the body do different jobs. They can be structural to build the body or enzymes to speed up chemical reactions in the body. Females have two X chromosomes - XX. The SRY gene on the Y chromosome causes the testes to produce the male sex hormone, androgen, which makes the embryo develop into a male.
Chromosomes come in pairs. They carry the same genes in the same place on each chromosome, so genes also come in pairs. If the man is Hh, he will get the disorder.
If the woman is hh, what percentage of their children will inherit the condition? Cystic Fibrosis. Caused by a faulty recessive allele fso a person may be a carrier of the faulty gene Ffbut not have cystic fibrosis.
Asexual and Sexual Reproduction. They are clones. They can be used for asexual reproduction. Clones are b1 you and your genes revision powerpoint produced when identical twins are formed. These are natural clones. Artificial clones can be made Dolly. Genetic Testing of Adults. Genetic testing is when an individual is tested for singles club ep er presence of a particular allele that may cause a genetic disorder.
Testing can be stressful and in some cases, a positive result may make it difficult to get a mortgage, job or life insurance. Genetic testing of foetuses. A couple may decide to have a genetic test on the foetus during pregnancy, if they know there is a risk they may pass on a serious genetic disorder to their children.
Doctors collect cells from the foetus during pregnancy, using an amniocentesis test, and then examine the genes of the foetus. If the child will inherit the genetic disorder, the parents may choose to have a termination abortion. Genetic testing of embryos. A couple may decide to use pre-implantation genetic diagnosis PGDto avoid passing on a serious genetic disorder to their children, without the possible need for a termination.
The ova are collected and mixed with sperm in a dish. B1 you and your genes revision powerpoint occurs. This is in vitro fertilisation IVF.
Cells from the embryos are tested for the presence of faulty alleles that cause the genetic disorder. Only embryos without the faulty alleles are implanted into the uterus of the woman to develop into a baby.
PGD can only be used for families with certain inherited conditions. Genetic Screening. Gene Therapy. Gene therapy involves introducing normal functional alleles into the cells of patients with a genetic disorder. In the future, it is hoped gene therapy will cure genetic disorders such as cystic fibrosis.
Therapeutic Cloning. Stem cells are unspecialised cells that can develop into different cell types. Scientists believe stem cells could be used to treat certain b1 you and your genes revision powerpoint diseases e. Embryonic stem cells are most useful because they can develop into any cell type found in the body. Toggle navigation.
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Presentation Transcript. What makes us all different? Chromosomes are made of DNA molecules Most features are also affected by the environment e. Weight, height, skin colour All living things are made of cells Different proteins in the body do different jobs.
They can be structural to build the body or enzymes to speed up chemical reactions in the body Genes are instructions which tell the cell how to make proteins. A fertilised human egg cell contains 23 pairs of chromosomes. Pair 23 are the sex chromosomes. Plants keep some unspecialized cells all their lives, which can become anything that the plant might need.
Genetic Testing of Adults Genetic testing is when an individual is tested for b1 you and your genes revision powerpoint presence of a particular allele that may cause a genetic disorder. Someone with a family history for a serious genetic disorder. Who would want b1 you and your genes revision powerpoint be tested? It helps them to plan their lives. Such as whether to have children of their own or not.
Are there any disadvantages? Genetic testing of foetuses A couple may decide to have a genetic test on the foetus during pregnancy, if they know there is a risk they may pass on a serious genetic disorder to their children. How is this done? What happens next? Are there any risks from testing? Does everyone agree with genetic testing of foetuses? Testing may lead to termination, which some people believe is wrong.
Genetic testing of embryos A couple may decide to use pre-implantation genetic diagnosis PGDto b1 you and your genes revision powerpoint passing on a serious genetic disorder to their children, without the possible need for a termination.
The woman is given fertility drugs, so she produces several ova at once. The fertilised eggs start to develop into embryos. Genetic Screening Genetic screening is when a whole population is tested for a particular allele. The NHS and Government decide whether to use genetic screening based upon: Employers Assess if employee will be fit to work in the future. May lead to discrimination of individuals. Individuals Make informed decisions.
May not want to know. Right to choose. Insurance Companies Assess if person is a higher risk. Charge higher premiums or refuse insurance. Gene Therapy Gene therapy involves introducing normal functional alleles into the cells of patients with a genetic disorder.
Introduce the normal alleles into cells of the patient. Find the gene that causes the disorder on a chromosome. Cut out the normal allele from another chromosome and make lots of copies of it. Therapeutic Cloning Stem cells are unspecialised cells that can develop into different cell types. Nucleus removed from egg cell. Egg cell triggered to develop into adobe creative suite manager embryo.
Embryo Stem cells are taken from the embryo and treated so qrss arduino develop into different cell types e. Revision History. Christianity Revision. Hardware Revision .
B1 You And Your Genes - ProProfs Quiz
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Related videosGCSE Science Biology (9-1) DNA and the Genome
Skip to content. You and Your genes. Genes,Chromosomes and DNA. Most cells in the human body have a nucleus. B1 you and your genes revision powerpoint contains your genetic material. The human body contains 23 pairs of chromosomes which 46 chromosomes in total. Genes control development, e. For example, the gene for eye colour has two alleles: A dominant allele is one which controls the development of a characteristic even if it is not present on only one chromosome in a pair.
A recessive allele is one which controls the deveopment of a characteristic only webspell 4 2 3a themes a dominant allele is not present, i.
Differences between individuals of the same species are described as variations. Variation may be due to: Genes- the different characteristics an individual inherits, e. Usually variation is due to a combination of genetic and enviromental causes. Genetic Diagrams. Genetic diagrams are used to show all the possible combinations of alleles and outcomes for a particular gene. They use captial letters for dominant alleles and lower case letters for recessive alleles.
Family trees can also be used to b1 you and your genes revision powerpoint how an individual has inherited a characteristiclike blue eye colour or not being able to roll their tounge. Sex Chromosomes. One of the 23 pairs of chromosomes in a human cell is the sex chromosomes. In females the sex chromosomes are identical;they are both X chromosomes. In males they are different;there is an X and a Y chromosome. The Y chromosome is much shorter than the X chromosome.
Rare Disorders. Most characteristics are governed by a range of genesso the presence of one fualty allele may not effect the overall …. Joe Varney Created on: Variation Differences between individuals of the same species are described as variations.
Sex Chromosomes One of the 23 pairs of chromosomes in a human cell is the sex chromosomes. Rare Disorders Most characteristics are governed by a range of genesso the presence of one fualty allele may not effect the overall …. Sign up to Comment. B5 Revision Powerpoint. B1 - You And Your Genes.
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