double recessive

double recessive

a GENOTYPE in which both ALLELES of a gene are of the recessive type, i.e. HOMOZYGOUS. See DOMINANCE (1).
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It is an unusual double recessive genetic mutation that causes the white plumage.
When you possess the double recessive mutant gene to be in agriculture, you think differently.
Field genetic populations of the reciprocal F1 generation, inbred F2 generation and the backcrossed BC1 generation of Burley21 and Maryland609 were constructed and the statistical analysis revealed that the inheritance of the yellow-green leaf color of burley tobacco was controlled by a double recessive gene.
Statistical analysis found that the probability value (P) of F2 and BC1 progeny were 0.401 and 0.066, respectively, both were larger than 0.05, this estimated that the inheritance of yellow-green leaf color of burley tobacco was consistent with the genetic law of double recessive trait controlled by nuclear gene.
White tigers are only born when two tigers that both carry the unusual gene for white colouring mate - their colour is caused by a double recessive allele.
Yellow seed was also produced in the double recessive condition, i.e., when both the genes were homozygous recessive (y1y1 gg).
The white birds are known scientifically as leucisitics, caused by a double recessive gene.
The results obtained for the Harosoy NILs are thus consistent with the results of previous studies (Buzzell and Voldeng, 1980; Saindon et al., 1989; Cober et al., 1996a, b), which indicate that a double recessive genotype for the e3 and e4 alleles is essential to the flowering under ILD without a marked delay.
Although the double recessive genetic male sterility (GMS) line, ms5ms6, of upland cotton has been extensively used in breeding programs, possible mechanisms of pollen abortion remain unknown.
Linkage estimates were made by LINKEM (Vowden et al., 1995) or the square root method where the double recessive class was used to estimate non-crossover gametes (coupling phase) and linkage is estimated by the following formula: linkage estimate = 1 - 2 [(frequency of double recessives).sup.1/2.
Using a late tiller, a single plant of the high-crossability class (double recessive genotype) was backcrossed to Columbus and the [BC.sub.1][F.sub.2] developed.
The 16 double heterozygotes and five double recessive homozygotes had like genotypes for the D1 and D2 loci.