Mammalian chimaeras / Anne McLaren.

  • Anne McLaren
Date:
[1976]
Catalogue details
    136/168 page 126
    126 Spontaneous chimaeras Primary oocyte (chiasma formation) First meioiic division First polar body Secondary oocyte Second meiotic division Second polar body Ovum Fig. 43. Segregation of genes during oogenesis, in relation to their distance from the centromere. A,a and B,b represent alleles at marker loci at which the mother is heterozygous, with A,a nearer to and B,b further from the centromere (centromeres indicated by circles). The diagram illustrates the situation where one chiasma has formed, between the two loci. 'at risk' in the mother of the chimaeric individual reported by Gartier et al. (1962), and five in that of Myhre et al. (1965), with two cell lines detected in each and no indication of a double maternal contribution in either. Such a result is fully compatible with type 4 in Table 13. and fits better with type 3 than with 1 or 2. Types 1 and 2 are rendered even more unlikely in the case
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