B1 - you and your genes 5.0 / 5 based on 1 ratingTeacher recommended ? ScienceGenetic variationGCSEOCR Created by: BeeBee777Created on: 20-09-13 11:30 Where are chromosomes found within a cell? Nucleus. 1 of 16 True or false - In humans, chromosomes are usually found in groups of four? False - Chromosomes are usually found ingroups of two 2 of 16 What are alleles? The Different versions of the same gene arecalled alleles 3 of 16 How do genes control the differentcharacteristics we develop? Each gene is a code for making a certain protein. proteins are the building blocks of cells. 4 of 16 What does genotype mean? This is the alleles that you inherit. 5 of 16 Name the two types of sex cells? Sperm - Egg 6 of 16 What does phenotype mean? The characteristics that an organism displays arecalled it's phenotype. 7 of 16 Is a persons weight deternimed by genes, the environment or a combination of both? A persons weight is determine by a combination of both their genes and the environment. 8 of 16 How many chromosomes are found in sex cells? 23 9 of 16 Why do children look a bit like both of theirparents but not identical to either? Half of the child chromosomes come from eachparent. 10 of 16 What is homozygous? If you're homozygous for trait, you have twoalleles the same for that particular gene. 11 of 16 What is hetrozygous? If your hetrozygous for trait, you have two different alleles for that particular gene. 12 of 16 What sex chromosomes do human males have? They have an x and y chromosome 13 of 16 How does a gene on one of the human sex chromosomes cause embryos to develop into males? The y chromosome carries a gene which causes a specific protein to be produced this makes an embryo develop into a male as it grows. 14 of 16 Is the allele for cystic fibrosis dominant or recessive recessive. 15 of 16 What are the symptoms of cystic fibrosis? Thick sticky mucus in the air passages, gut and pancreas. 16 of 16
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