. Cell heredity. Cytogenetics. A green heterozygous Yellow haploid (y) or diploid (v/+ +/w) sector diploid (y/y) sectors from from a heterokaryon of a green heterozygous constitution y + diploid colony (>>/ + ) *When the two chromosomes P"^° -^ and are in different nuclei in paba y a heterokaryon, the genotype is written - ; when the two chromosomes + + , paba y are m the same diploid nucleus, the genotype is written — FIGURE Sectored colonies of Aspergillus. The presence of both parental chromosome sets in the diploid nucleus can also be demonstrated by somatic recombination
. Cell heredity. Cytogenetics. A green heterozygous Yellow haploid (y) or diploid (v/+ +/w) sector diploid (y/y) sectors from from a heterokaryon of a green heterozygous constitution y + diploid colony (>>/ + ) *When the two chromosomes P"^° -^ and are in different nuclei in paba y a heterokaryon, the genotype is written - ; when the two chromosomes + + , paba y are m the same diploid nucleus, the genotype is written — FIGURE Sectored colonies of Aspergillus. The presence of both parental chromosome sets in the diploid nucleus can also be demonstrated by somatic recombination and a process of chromosome reduction which cause heterozygous diploid colonies to show sectors for color. For example, heterozygotes from a heterokaryon between yellow (y) and white (w) auxotrophs of this composition, 2 ^ "*" "*" form yellow and white sectors that are no longer hetero- + + wad zygous for color markers and sometimes not for auxotrophic markers either (Figure ). About 15 per cent of these sectors give rise to haploid conidia. When white haploid patches are selected, half are of genotype paba y w ad and half are + + w ad, showing an independent behavior of the two chromosomes in the reduction process. When yellow haploid patches are selected, they are all paba t/ + + . The alternate. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sager, Ruth; Ryan, Francis J. (Francis Joseph), 1916-. New York, Wiley
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