1. Meiosis And Dihybrid Cross

Meiosis and the Dihybrid Cross Genetics & Adaptation SQA HIGHER BIOLOGY

Learning Content ,[object Object],[object Object],[object Object],[object Object],[object Object]

Sex ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Meiosis ,[object Object],Diploid Cell with uncoiled replicating chromosomes. Chromosomes coil and become visible.

Crossing Over ,[object Object],[object Object],[object Object],[object Object],[object Object]

Monohybrid Cross ,[object Object],[object Object],[object Object],[object Object]

Monohybrid Cross ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],R r

Monohybrid Cross ,[object Object],[object Object],R r Phenotype ratio 100% plants producing round seeds Genotype ratio 100% heterozygotes Rr Rr

Monohybrid Cross ,[object Object],[object Object],[object Object],[object Object],[object Object],R r R r

Monohybrid Cross ,[object Object],[object Object],R R r r Genotype ratio 25% RR 50% Rr 25% rr Phenotype 3:1 round seeds: wrinkled seeds or ratio 75% plants producing round seeds 25% plants producing wrinkled seeds rr Rr Rr RR

Dihybrid Cross ,[object Object],[object Object],[object Object],[object Object]

Mendel’s Results ,[object Object],[object Object],F1 offspring 100% plants with round and yellow seeds F1 intercross plants with round x plants with round and yellow seeds and yellow seeds F2 offspring Total 556 seeds collected from F2 plants Ratio 315 9 round and yellow seeds 108 3 round and green seeds 101 3 wrinkled and yellow seeds 32 1 wrinkled and green seeds However, the ratio of dominant to recessive features is still 3:1

Explanation of the results ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],RY ry RY ry RrYy

Explanation of the results ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],RY Ry rY ry ry rY Ry RY

Explanation of the results ,[object Object],RY Ry rY ry RY Ry rY ry rryy rrYy Rryy RrYy rrYy rrYY RrYy RrYY Rryy RrYy RRyy RRYy RrYy RrYY RRYy RRYY

Explanation of the results ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Learning Content ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Recombination ,[object Object],[object Object],[object Object]

Linkage ,[object Object],[object Object],[object Object],[object Object],[object Object]

Linkage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Linkage ,[object Object],[object Object],[object Object]

Frequency of Recombination ,[object Object],[object Object],[object Object],Number of F 2 recombinants Total number of F 2 offspring x 100

Chromosome Maps ,[object Object],[object Object],[object Object],[object Object]

Chromosome Maps ,[object Object],10 C/c x D/d 8 B/b x D/d 18 B/b x C/c 3 A/a x D/d 13 A/a x C/c 5 A/a x B/b Recombination Frequency (%) Genes

Sex Linkage ,[object Object],[object Object],[object Object],[object Object],[object Object]

Red-green colour blindness ,[object Object],[object Object],[object Object],[object Object],[object Object]

Red-green colour blindness ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Phenotypes Normal Female : Carrier Female : Normal Male : Colour blind Male 1 : 1 : 1 : 1 X N X n X N Y X n Y X N Y Y X N X n X N X N X N Male Gametes X n X N Female Gametes

Showing genetic pedigree ,[object Object],[object Object],[object Object],[object Object],1 2 I 1 2 3 4 5 II 1 2 3 4 5 III

Haemophilia ,[object Object],[object Object],[object Object],[object Object]

Practice Questions ,[object Object],[object Object],[object Object],[object Object]

1. Meiosis And Dihybrid Cross

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1. Meiosis And Dihybrid Cross