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Tuatara: Volume 13, Issue 1, April 1965

Fig. 8: Illustration of the genetic significance of a crossing over. Two pairs of gene units (arbitrarily lettered) are shown on the homologous chromosomes, one of the chromosomes with the genetic units as T and W, the other with homologous, though allelic, units ° and w. At a, the chromosomes are duplicated along their lengths and, therefore, at their genetic loci, ° and w or T and W. A single cross-over between the two genes is shown. b, anaphase I. c, anaphase II. Each of the four chromosome…

Fig. 8: Illustration of the genetic significance of a crossing over. Two pairs of gene units (arbitrarily lettered) are shown on the homologous chromosomes, one of the chromosomes with the genetic units as T and W, the other with homologous, though allelic, units ° and w. At a, the chromosomes are duplicated along their lengths and, therefore, at their genetic loci, ° and w or T and W. A single cross-over between the two genes is shown. b, anaphase I. c, anaphase II. Each of the four chromosomes at anaphass II has a unique genetic make-up; two are parental (Tw and °w); two are recombinants (Tw and °W).

Fig. 8: Illustration of the genetic significance of a crossing over. Two pairs of gene units (arbitrarily lettered) are shown on the homologous chromosomes, one of the chromosomes with the genetic units as T and W, the other with homologous, though allelic, units ° and w. At a, the chromosomes are duplicated along their lengths and, therefore, at their genetic loci, ° and w or T and W. A single cross-over between the two genes is shown. b, anaphase I. c, anaphase II. Each of the four chromosomes at anaphass II has a unique genetic make-up; two are parental (Tw and °w); two are recombinants (Tw and °W).