Inheritance of the king coat colour pattern in cheetahs ... - CERU

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576 R. 1. VAN AARDE AND ANN VAN DYK M F M F Chris- A- - Lady Frik-- A- --Gill 1976 [ 1976 F M M M F F F M Jean Ben F Jumper ~ 1977 1977 F20 F M M M M M M M M35 F F ~. A 1981 I i I i I M M M M M King 1981 i I i F F M King A A 1983 i i I i I U U U U U King King , / v Died as infants A J ":~ 11983 F F F M 1984 King i i i 1983 ~ M U U U Died as infants King U U U U 1984 '------v--------./ King King U ~------vr-----~ King ----+ Died as infants Died as infants FIG. 1. Pedigree of the nine King cheetahs born at the De Wildt Cheetah Research Centre between 1981 and 1984 (M = males; F = females; U = sex unknown). I
INHERITANCE OF KING COAT COLOUR 577 T ABLE I Observed and expected numher of King and wild tl'pe progeny from matings hetween different presumed genotypes. The calculation of the expected numbers were based on the hypothesis that the King phenotype results from a single autosomal recessive mutant Number Observed Expected of TM~ ~ Mating litters progeny King Wild type King Wild type value 8 26 9 17 6·5 19·5 0·32 TABLE II The relationship hetween phenotype and survival of cubs produced during 1981, 1983 and 1984 at the De Wildt Cheetah Research Centre Number of cubs Phenotypes surviving dying King 3 6 Wild type 23 49 Total 26 55 Mortality The information in Fig. 1 indicates a high infant mortality amongst captive cheetahs, Kings also succumbing with only three surviving to adulthood. Two of them had to be hand-raised due to abandonment by the mother. However, the proportion of King cheetahs dying as infants did not differ significantly from the proportion of wild type individuals that died (x 2 = 0·01; Table II). Discussion The breeding of King cheetahs from a captive group of wild type cheetahs removes all doubts regarding the specific status of A. rex and confirms earlier suggestions (Pocock, 1939; Robinson, 1976; Hills & Smithers, 1980) that the King cheetah merely represents a colour variant of A.jubatus. Furthermore, our information provides evidence that the king trait is inherited as an autosomal recessive allele, which probably arose from a mutation at the tabby locus. The concept of gene homology is generally accepted today (Robinson, 1970, 1976). Most felids have a characteristic and consistent striped, spotted or rosetted pattern of dark pigment overlaid on an agouti background (Robinson, 1976). Based on information available from Domestic cat breeding, this basic pattern appears to be controlled by a single locus, designated the tabby locus (Robinson, 1976). The apparent similarities between the blotched tabby and king phenotypes and patterns of inheritance may be interpreted as suggesting homology and support the hypothesis that the King cheetah represents a colour variant resulting from a mutation at the tabby locus.
Page 1 and 2: 1. Zool., Lond. (A) (1986) 209, 573
Page 3: INHERITANCE OF KING COAT COLOUR 575

Inheritance of the king coat colour pattern in cheetahs ... - CERU

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