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The Chromosome Basis of Heredity and Linkage
pensatory Effect of Other Gene Differences between Male
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abnormal achaete alleles appear autocatalytic autosomes balanced lethals become bobbed breaks caused cent centromere changes character chro chromatin chromo chromocentral region chromonema containing crossing crossing-over crossover cytological deficiencies deleted dominant dosage compensation dose Drosophila Drosophila melanogaster evidence evolution experiments fact female fertility flies fragment frequency gametes gene mutations genetic germ cells given groups H. J. Muller heterozygotes heterozygous homologous homozygous hypomorphic individuals inert region inversions involving irradiation kind latter left end linear linkage loci locus male material melanogaster method mitosis mosome muta mutant genes mutation rate nature normal allelomorph normal gene observed obtained occur organisms original phaenotypic position effect possible present probably produced question radiation reactions rearrangements recombination salivary gland scute scute 19 second chromosome selection sex-linked shown species sperm spermatozoa sterility structure tests tetraploid third chromosome tion translocation truncate twins viability visible X-chromosome X-rays