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THE BASIS OF ORGANIC INHERITANCE i Chromosomes and Genes
The Chromosomes in Somatic Division the Reduction Division
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abnormal gene affected males affected persons albinos alleles amongst anonychia antigen appear autosomal average bearing the normal borne genes carrier carry the gene cent chance chapter child chromo chromosome bearing Chromosome diagram showing chromosome pair colour blind condition congenital course cousins crossover daughters defects disease dominant gene example family group family history female FERTILIZATION gametes gene frequencies genes in common genetic constitution haemoglobin haemophilia haemophilic happen hereditary heterozygotes heterozygous heterozygous women homozygote homozygous human genetics illustrated in Fig important individual inheritance instances kind linkage loci married mating mongols mother multifactorial nail-patella nail-patella syndrome normal gene normal male observed occur offspring ovum parents Pedigree illustrating population possible probably proportion rare ratio recessive genes red cells REDUCTION DIVISION relatives result Rhesus risk sex linkage sex linked genes shown in Fig sibs sibships sickle cell anaemia single gene sometimes spermatozoon syndrome thalassaemia trait usually woman X chromosome