OCR Biology; Unit 5. Section 2: Inheritance (A2) Meiosis Genetics Inheritance Phenotypic ratios and Epistasis Chi - Squared 5.0 / 5 based on 4 ratings ? BiologyDNA, genetics and evolutionA2/A-levelAll boards Created by: Sophie KempCreated on: 06-06-11 16:51 What is the correct sequence of meiosis? P1 M1 A1 T1 P2 M2 A2 T2 1 of 23 What is the name given to a homologous pair of chromosomes? Bivalent 2 of 23 What is the name given to points where non - sister chromatids wrap around each other and join up Chiasma 3 of 23 What is a phenotype? An observable characteristic 4 of 23 What is linkage? When two genes for different characteristics are present at different loci on the same chromosome 5 of 23 When does crossing over occur? Prophase I 6 of 23 After meiosis II, each daughter cells will be what? Haploid 7 of 23 What is codominance? A characteristic where both alleles contribute to the phenotype 8 of 23 A homogametic female will have which chromosomes? ** 9 of 23 Why is haemophillia, a recessive, sex linked disease coded for by an allele only carried on the X chromosome, more common in men? Men only have one X chromosome so can only carry one allele 10 of 23 If the presence of a recessive allele prevents the expression of another this is what? Recessive epistasis 11 of 23 A phenotypic ratio of 9:3:3:1 suggests what? Normal dihybrid inheritance 12 of 23 A phenotypic ratio of 9:3:4 suggests what? Recessive epistasis 13 of 23 A phenotypic ratio of 9:7 suggests what? Epistasis by complimentary action 14 of 23 What is the critical value for a Chi - squared (X^2) test 0.05 15 of 23 What is the Chi - squared (X^2) test used for? Checking the results of a genetic cross 16 of 23 If your value for Chi - squared (X^2) is BELOW the critical value, what is your assumption? Accept null hypothesis - any difference is due to chance and is not significance 17 of 23 Should the sample size be small or large for a Chi - squared (X^2) test? Large 18 of 23 Can the Chi - squared (X^2) test be used for data presented as percentages or ratios? No 19 of 23 Can the Chi - squared (X^2) test be used when there are zero scores? No 20 of 23 What does the O stand for in a Chi - squared (X^2) test? Observed 21 of 23 A phenotypic ratio of 12:3:1 or 13:3 suggests what? Dominant epistasis 22 of 23 A, B and O are all alleles coding for blood type, which is recessive? O 23 of 23
Comments
No comments have yet been made