Biology 1 topic 1 0.0 / 5 ? BiologyVariety of life and classificationVariation and reproductionEvolution, extinction and natural selectionGenesGCSEEdexcel Created by: emz_mayCreated on: 06-03-16 15:01 What are the characteristics of an organism in the animal kingdom? Animals are heterotrophs, and are multicellular but don't have a cell wall or chlorophyll. 1 of 20 What characteristics do organisms in the Chordata phylum have in common? They have a supporting rod-like structure (backbone). 2 of 20 What does oviparous mean? Oviparous is when animals lay eggs to reproduce. 3 of 20 Define the term species? A species is a group of living organisms that can interbreed to produce fertile young and have similar characteristics. 4 of 20 What is the name of offspring from two different species? A hybrid. (Liger = lion and tiger) 5 of 20 What two things cause variation? Genes and the environment. 6 of 20 What is continuous variation? Continuous variation is when there is variation within a species in a certain range. 7 of 20 What is discontinuous variation? Discontinuous variation is when variation in a species is split into certain groups e.g. blood type. 8 of 20 Give two ways deep sea fish have adapted to their habitat. 1, Some fish emit light. 2, Some have huge mouths. 3, Some have huge eyes and long feelers. 9 of 20 Give two ways polar bears have adapted to the polar regions. 1, They have a small surface area to reduce heat loss. 2, They have thick fur and blubber to trap air. 10 of 20 Give three ways the scientific community validate evidence. 1, Scientific journals 2, Peer reviews 3, Scientific conferences. 11 of 20 What is speciation? Speciation is when two organisms in the same species become so genetically different they can no longer produce fertile offspring. 12 of 20 How many pairs of chromosomes does a human cell nucleus contain? 23 pairs. 13 of 20 What is an allele? An allele is two or more versions of the same genes. 14 of 20 What does it mean by a heterozygous organism? A heterozygous organism is when an organism has two alleles that are different. 15 of 20 What does it mean by a homozygous organism? a homozygous organism is when an organism has two alleles of the same gene. 16 of 20 What is the difference between a dominant and a recessive allele? A dominant allele is the one that physically appears, a recessive allele doesn't. 17 of 20 What are the symptoms of cystic fibrosis? Breathing difficulties, lung infections, malnutrition and fertility issues. 18 of 20 What are the symptoms of sickle-cell anaemia? Tiredness, painful joints and muscles, fever and anaemia. 19 of 20 Is the allele for Sickle-cell anaemia dominant or recessive? Recessive, as genetic disorders are cause by faulty recessive alleles. 20 of 20
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