NATS 1675 Lecture Notes - Lecture 6: Punnett Square, Dihybrid Cross, Abo Blood Group System
28 Feb 2016
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Definitions: species is defined as populations of organisms that retain their individuality in nature because they are reproductively isolated from other species around them. Genes have to pair up to form a functional organism. Related species mate, they can and do produce offspring. Hybrid: an organism produced form 2 different species or genotypes. Example: female horse + male donkey = mule, male horse (64) + female donkey (62) = hinny, changing the order of parents can greatly impact the result. Hybrids are usually incapable of reproduction themselves. Rr: homozygous, has one of each gene (hybrid) rr: recessive: phenotype the appearance of an organism with regard to an inherited characteristic (trait) or all inherited characteristics. The phenotype is produced by the genotype in cooperation with the environment, Example: r = round pea seeds, r = wrinkled pea seeds, (r = dominant, r = recessive, locus (loci pl. Colour: allele a pair of genes that occupy corresponding positions on homologous chromosomes.
