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f1 f4 stable or unstable strains?


Polar Bear
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Guest superbluehaze

Fuzzy has summed it up quite nicely.

In a f1 cross with two plants that come from different geographical areas(and therefore, have separate gene pools), then all the dominate genes line up and are expressed in the f1 hybrid, which will display hybrid vigor.

All traits transmitted from generation to generation must be contained in the pollen of the male plant(staminate plant) and the ovule of the female plant(pistillate plant). Fertilization combines these two sets of genetic information, and a seed is formed. The pollen and ovule are known as gametes, and the "program" that determines the expression of a trait are called genes. Each plant has 2 identical sets of genes upon fertilization, one set (gametes - 1n) from each parent combine to form a seed.

With the weed the haploid(1n) number of chromosomes is 10 and the diploid (after fertilization) is 2n, and the number of chromosomes is 20. Each chromosome contains 100's of genes, which influence each phase of growth and development of the plant.

If two plants share a genetic trait, and their off spring all exhibit the very trait, and all future inbred generations also have it, then the strain is said to be true breeding for that trait.

If two F1 hybrids are crossed, then the genes do not align and instead segregate so that the F2 generation displays a wide diversity of traits, then the offspring are said not to breed true for that particular trait; then it is a F2 hybrid, and is an unstable strain, as its off spring show a wide diversity of traits, and each plant will be very different from its siblings.

happy growing

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