heterozygoten.

1902 W. Bateson & E. R. Saunders Rep. to Evol. Comm. Royal Soc. No. 1. 126 The zygote formed by the union of a pair of opposite allelomorphic gametes, we shall call a heterozygote.

1902 W. Bateson Mendel's Princ. Heredity 23 This Aa is the hybrid or ‘mule’ form, or as I have elsewhere called it, the heterozygote, as distinguished from AA or aa the homozygotes.

1906 R. H. Lock Variation, Hered. & Evol. vii. 186 (plate) Cobs borne by heterozygote plants pollinated with the recessive.

1930 R. A. Fisher Genetical Theory Nat. Selection 8 The heterozygote when mated to either kind of homozygote would produce both heterozygotes and homozygotes.

1949 C. D. Darlington & K. Mather Elements of Genetics v. 110 The original form of any heterozygote must be a mutation.

1971 J. Z. Young Introd. Study Man iii. 60 Apparently the heterozygotes have an increased resistance.

1952 Hershey & Chase in Cold Spring Harbor Symp. Quant. Biol. XVI. 474/1 Since there is adequate reason to call these markers allelic genes, the mottling particles are appropriately termed heterozygotes.

1968 D. S. Ray in Fraenkel-Conrat Molec. Basis Virol. ii. 247 The purified heterozygotes are twice the length of normal phage particles and apparently contain two DNA molecules.

1905 Rep. Brit. Assoc. 1904 585 Appearances have been seen..suggesting at first sight that a heterozygosis between two gametes, both extracted, may give, e.g., dominance.

1914 G. H. Shull in Zeitschr. f. induktive Abstammungsund Vererbungslehre 12 127 I suggest that instead of the phrases, ‘stimulus of heterozygosis’, ‘heterozygotic stimulation’, ‘the stimulating effects of hybridity’, ‘stimulation due to differences in uniting gametes’, etc...the word ‘heterosis’ be adopted. The corresponding adjective ‘heterotic’ may also be useful in such expressions as ‘heterotic effects’.

1918 E. B. Babcock & R. E. Clausen Genetics in Relation to Agric. 233 When..the differences are not great enough to obstruct normal cell division, the degree of stimulation is held to increase directly with the amount or kind of heterozygosis present.

1912 E. M. East & H. K. Hayes Heterozygosis in Evol. & Plant Breeding 37 Decrease in vigor due to inbreeding lessens with decrease in heterozygosity.

1949 C. D. Darlington & K. Mather Elements of Genetics xii. 261 It is only when a heterozygous species is crossed with another, heterozygous or homozygous, that its heterozygosity is shown by the mixture in the progeny.

1930 R. A. Fisher Genet. Theory Nat. Select. 57 The viability and general fitness of the heterozygoted.

1911 Amer. Naturalist 45 142 The surprises of heterozygotic ‘constructions’ or of new combinations in F₂ may..be responsible for the case of De Vries's buttercups.

1949 C. D. Darlington & K. Mather Elements of Genetics xiii. 280 (caption) The potential variability existing in the differences between homozygotes..must first be converted into heterozygotic potential by intercrossing.

1902 W. Bateson & E. R. Saunders Rep. to Evol. Comm. Royal Soc. No. 1. 130 The determination from statistical study of zygotes must be exceedingly difficult, seeing that both resulting forms may be heterozygous.

1965 T. Dobzhansky Heredity & Nature of Man v. 156 Although persons who inherit this gene from both parents (homozygotes) die of fatal anemia, the heterozygous carriers may be said to show a hybrid vigor..in malaria-ridden environments.