Biology - Variation and Inheritance 0.0 / 5 ? BiologyVariation and reproductionNational 5SQA Created by: rkendall160Created on: 09-12-19 16:15 Define the term 'species' Members of the same species can be interbreed to produce fertile offspring. 1 of 16 What does discrete variation mean? Members of the same species show variation (slight difference) in their characteristics 2 of 16 What is an example of discrete variation? Tongue rolling, ear lobe shape, seed shape 3 of 16 What does continuous variation? These characteristics that are controlled by more than one gene. The measurements are by a controlled range of values between a minimum and a maximum 4 of 16 What is an example of continuous variation? Height, weight and hand span 5 of 16 What is a gene? A section of DNA that determines 1 characteristic (protein) eg eye colour 6 of 16 What is an allele? Different forms of a gene eg brown, blue, green, hazel and grey 7 of 16 What is a genotype? The combination of alleles you possess for a specific gene 8 of 16 What is a phenotype? The 'expressed' trait/characteristic - how it physically appears 9 of 16 What does the term homozygous mean? The person has two copies of the same allele (eg TT or tt) 10 of 16 What does the term heterozygous mean? The person has two different alleles for the gene (eg Tt) 11 of 16 What does dominant mean? The most common form of the gene, one copy is enough to express this form 12 of 16 What does recessive mean? The least common form of the gene? two copies are required to express this form 13 of 16 What is parent generation? The initial couple which is bred 14 of 16 What is the F1 generation? The offspring produced from the parents 15 of 16 What is the F2 generation? The offspring produced if the F1 generation interbreed 16 of 16
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