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Genetic Crosses Heredity – Crosses Introduction http://www.brainpop.com/science/cellularlifeandge netics/heredity/ Dominant and Recessive http://www.bbc.co.uk/learningzone/clips/dominant-and-recessive-characteristics/4197.html https://www.glowscience.org.uk/mindmap/#!/biology/cells_and_dna/genetics A true breeding black mouse is crossed with a true breeding white mouse. Black colour is dominant. or or A true breeding black mouse is crossed with a true breeding white mouse. Black colour is dominant. or or A true breeding brown eyed human is crossed with a true breeding blue eyed human. Brown colour is dominant. or or A true breeding brown eyed human is crossed with a true breeding blue eyed human. Brown colour is dominant. or or A true breeding red flower is crossed with a true breeding white flower. Red flower colour is dominant. A true breeding normal winged fly is crossed with a true breeding vestigial winged fly. Normal wing shape is dominant. A true breeding black rabbit is crossed with a true breeding white rabbit. Black fur colour is dominant. Complete the cross to show the phenotypic ratio of the F2 generation. A true breeding purple flower is crossed with a true breeding white rabbit. Purple is dominant. Complete the cross to show the phenotypic ratio of the F2 generation. A true breeding regular thumbed human is crossed with a true breeding hitchhiker thumbed human. Regular thumb shape is dominant. Complete the cross Eyes http://subscription.echalk.co.uk/Science/biology/Ey eColour/EyeColour.htm Word 1 Gene 2 Allele 3 dominant 4 Recessive 5 Chromosome Homozygous (true breeding) 6 Hetero7ygous 7 Phenotype 8 Genotype 9 Definition Large pieces of DNA Sections of a chromosome which codes for a characteristic Different forms of a gene Allele whose effect always shows in the phenotype Allele whose effect is hidden in the phenotype Both alleles in genotype are the same e.g. BB or bb Alleles in genotype are different e.g. Bb The appearance of an organism The alleles an organism has for a particular characteristic
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