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The Inheritance of the Crescent and Twin Spot

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The Inheritance of the Crescent and Twin Spot THE INHERITANCE OF THE CRESCENT AND TWIN SPOT MARKING IN XIPHOPHORUS HELLERI ALICE MARRIN KERRIGAN The Teachers College oj the City of Boston, Boston, Massachusetts Received January 12, 1934 INTRODUCTION The viviparous teleost, Xiphophorus helleri, was first described and named by the naturalist, HECKEL,in 1848. The genus Xiphophorus has the lower rays of the caudal fin in the males prolonged into a long sword- shaped appendage which is sometimes as long as the rest of the fish. The anal fin of the male is modified into an intromittent organ, the gonopodium. The classification of Xiphophorus helleri, according to HUBBS(1924) is as follows: Order : Cyprinodontes Family : Poeciliidae Sub-family : Poeciliinae Tribe: Xiphophorini Genus : Xiphophorus According to REGAN(1913), these are three species: 1. X. montezumae 2. X. helleri 3. X. brevis This paper deals with Xiphophorus helleri, variety.rachovii. This variety was thought by REGANin 1911 to be a new species which he called X. rachovii in honor of ARTHURRACHOW of Hamburg, Germany, who sent him the specimens. These fish had a pair of conspicuous blackish spots, one above and one below, at the base of the caudal fin. In his revision in 1913, however, REGANconsidered them as a variety of X. helleri. I have found that some of these fish show two spots at the base of the caudal fin, while other animals have the spots continuous at the base of the caudal fin to give the appearance of a crescent. I have indicated the one with spots as twin spot, and the other as crescent. BREEDING TECHNIQUE In breeding Xiphophorus helleri, the fish were kept in small balanced aquaria. Unmated females were used for all crosses. This stock of immature virgin females was kept intact by removing the young fish which showed a thickening of the fore-margin of the anal fin. One or more females were placed with a single male. When the female showed signs of pregnancy, GENETICS19: 581 N 1934 582 ALICE MARRIN KERRIGAN she was removed to a tank well stocked with floating plants and fed with live food. After the birth of the fish, the female was removed and the young left in the aquarium. Each young fish was placed in a 50 cc beaker and carefully examined with a hand lens. In transferring all fish, even the mature, I have followed the practice of keeping them in water. Either a specially constructed glass P CRESCENT 6 CRESCENT p FI NON-CRESCENT CRESCENT RATIO 3 :I FIGURE1.-The mating of a heterozygous crescent male with a heterozygous crescent female. cup-shaped container having a handle about twelve inches long or a glass beaker served as a transfer medium. After the examination of each fish, the young were returned to the container in which they were born. These young were allowed to remain in this container for at least two months be- fore being removed to a larger one. EXPERIMENTAL DATA The stock used in the following experiments was obtained from F. W. SCHUMACHER,753 Center Street, Jamaica Plain, Massachusetts, with the INHERITANCE IN XIPHOPHORUS 583 exception of a crescent male (Series 13-1) which was purchased from WIL- LIAM TRICKER,INC., Saddle River, New Jersey. The work was begun in October, 1930. A male crescent was mated with three females, two of which showed no crescent marking. The following experiments will prove the genotype of the male to be CG Pp and the female crescent CG PP. The results of the mating of the crescent male with the crescent female is shown in the fol- lowing table (see also figure 1). TABLE1 CRESCENT NON-CRESCENT SERIES BROOD QENERATION DATE - NUMBER NUMBER MALES FEMALES MALES FEMALES 11-1 FI February9,1931 1 3 5 2 11-1 FI July 22,1931 2 1 2 2 Total 11 4 Expected on basis of CcX Cc-3 : 1 11:25 3:75 The factor for crescent marking is evidently dominant and the parents are heterozygous for this factor. The genotypes of brood 1 of the F1 as regards the crescent marking was next determined. A non-crescent male of F1 mated with a crescent female of F1 gave the results shown in table 2 (see also figure 2. In this drawing, the reciprocal cross is indicated). TABLE2 EERIE8 BROOD QENERATION DATE CRESCENT NON-CRESCENT NUMBER NUMBER 21-1 Fa 1 March 24,1932 5 2 21-1 Fa 2 April 24, 1932 7 6 21-1 Fz 3 May 22,1932 10 9 21-1 Fz 4 July 9,1932 16 24 21-1 F2 5 August 23,1932 9 9 Total 47 50 Expected on basis of CcXcc-1: 1 48.5 48.5 This crescent female is, therefore, heterozygous for the crescent factor. The same male was mated with another crescent female giving the results in table 3. TABLE3 SERIES BROOD QENERATION DATE CUESCENT NON-CRESCENT NUMBER NUMBER 2 1-2 Fa 1 May 22,1932 19 0 21-2 Fz 2 June 24,1932 13 0 21-2 Fz 3 August 7,1932 12 0 Total 44 0 Expected on basis of CCXcc 44 0 584 ALICE MARRIN KERRIGAN The female is, therefore, homozygous for the crescent factor, while the former female is heterozygous. The other non-crescent male of brood 1 of F1 was mated with another crescent female, giving the results shown in table 4. P NON- CRESCENT p CCPP NON-CRESCENT p ccpp FI CRESCENT CRESCENT NON-CRESCENT NON - CRESCENT RATIO I :I RATIO l:l:iX FIGURE2.-The mating of a heterozygous crescent male with non-crescent females. TABLE4 "8 BROOD N-ER QENERhTlON DATE CRESCENT NON-CREBCENT NIMEXER 22-1 Fz 1 April 24, 1932 3 4 22-1 Fz 2 May 19,1932 3 5 22-1 Fz 3 June 28,1932 16 15 22-1 Fz 4 August 1.53 1932 10 7 Total 32 31 Expected on basis of CcXcc-1: 1 31.5 31.5 INHERITANCE IN XIPHOPHORUS 585 This female is heterozygous for the crescent factor. The genotypes of the three females may be represented by Cc, CG, and CC. C=dominant crescent gene and c = the recessive non-crescent gene. The two female non-crescents of the brood died when half grown, so that the male crescents were mated with non-crescent females obtained in the breeding of Xiphophorus helleri, which showed no crescent markings. The males were removed from the brood at the appearance of the thicken- ing of the anal fin. The males were kept in a twenty gallon tank and the females in a twenty-five gallon tank. The data on the breeding of the two non-crescent animals is as follows: TABLE5 SERIES BROOD NUMBER OF NON- QENERATION DATE NUMBER NUMBER NUMBER lBESCENT YOUNQ 12 Fi 1 April 30, 1931 1 10 12 Fi 1 July 22,1931 2 5 12 Fi 2 April 14, 1931 1 23 12 Fi 2 July 13,1931 2 10 12 Fi 3 August 17,1931 1 15 Total 63 Of the 63 non-crescent offspring, only 51 lived to reach maturity, even though they were kept in fairly large containers. Of the 51, 20 were females and 31 were males. The male crescents of the F, of series 11-1 were mated with females of series 12. There were only two crescent males since one died. One crescent male mated with a non-crescent female gave the results in table 6. TABLE6 BROOD 8ERIE8 QENERATION DATE CRESCENT NON-CKESCENT NUMBER NUMBER 23-1 Fz March 24,1932 1 22 0 23-1 Fz April 30,1932 2 26 0 23-1 Fz June 20,1932 3 18 0 Total 66 0 Expected on basis of CCXcc 66 0 This male is evidently homozygous for the crescent factor. The other male crescent mated with a female of series 12 gave the results in table 7. TABLE7 SERIES BROOD TWIN NON- QENERATION DATE CRESCENT NUMBER NUMBER SPOT CRESCENT 24-1 Fz August 17,1932 1 5 1 8 24-1 Fz October 6,1932 2 17 6 24 261 Fz December 6,1932 3 8 3 16 Total 30 10 48 Expected on basis of 3 : 1 :4 33 11 44 586 ALICE MARRIN KERRIGAN This same male crescent mated with another female of series 12 gave the results in table 8 (see also figure 2). TABLE8 SERIES BROOD TWIN NON- GENERATION DATE CRESCENT NUMBER NUYBER BPOT CRESCENT 24-2 Fz June 20,1932 1 1 2 1 24-2 F2 August 5,1932 2 2 1 1 24-2 Fz September 7,1932 3 2 2 6 242 Fz November 15,1932 4 0 0 2 Total 5 5 10 Expected on basis of 1: 1 : 2 5 5 10 This same male crescent mated with a third female of series 12 gave the results in table 9 (see also figure 2). TABLE9 BERIB8 BROOD TWIN NON- QENERATION DATE CRESCENT NUMBER NUMBER BPOT CBEBCENT 24-3 FP August 23,1932 1 1 0 1 24-3 Fz October 6,1932 2 1 1 4 Total 2 1 5 Expected on basis of 1: 1 : 2 2 2 4 This male is heterozygous for the crescent factor. Of the five crescent fish tested in the F1 of series 11-1, three are heterozygous and two are homozygous for crescent marking. The genotype of the females may be represented by Cc, Cc, and CC,-the males by CC and Cc. There is, however, another factor that is introduced-that of twin spots. In this case, the crescent at the base of the tail fin is incomplete.
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