Technology of storage and primary processing of agricultural products
Multifaceted (poleytropic) effects of genes
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Biologiya laboratoriya 2021
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Multifaceted (poleytropic) effects of genes
We have considered above the influence of several genes on the development of a single trait . However, the effect of a single gene on the development of several traits has also been identified. This phenomenon is called poleytropy (from the Greek words poleo-plural, tropia-direction of influence). The phenomenon of polyetropia is widespread in nature and is of great importance. This phenomenon is found in many genes of plants and animals. Ranunculaceae family suviygar burn a single gene red flower, purple barglarinning color to be the largest extension of the stem, seeds and white. In chickens, for example, curly-haired forms are found. Such feathers do not stick to the chicken body, often break . This increases with the hot, digestive , cardio-vascular system is broken. These, in turn, negatively affect the chicken’s ability to reproduce and viability . The gene that determines the curls of feathers is the polytropic gene. An example for solving problems. In wheat, the red color of the grain is determined by two pairs of polymer dominant genes . The two dominant genes are homozygous, giving A I A I A 2 A 2 a dark red color . They are white with a grain of wheat breeding F 1 and F 2 generations dressing ?. Solution; Characters; Genes; dark red A 1 , A 1 , A 2 , A 2 red A 1 , A 1 , A 2 or A 1 , A 2 , A 2 light red A 1 , A 2 redness A 1 or A 2 colorless (white) a 1 , a 1 , a 2 , a 2 Confusion scheme R A 1 A 1 A 2 A 2 x a 1 a 1 a 2 a 2 Gametes A 1 A 2 a 1 a 2 F I A 1 a 1 A 2 a 2 light red If first-generation hybrids are crossbred, F 2 generation is obtained A 1 a 1 A 2 a 2 x A 1 a 1 A 2 a 2 Gametes A 1 A 2 , A 1 a 2 , a 1 A 2 , a 1 a 2 A 1 A 2 , A 1 a 2 , a 1 A 2 , a 1 a 2 Download 375.5 Kb. Do'stlaringiz bilan baham: 
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