Mechanisms of reproductive isolation

Mechanisms of reproductive isolation
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  • Interspecific hybrids are bred by way of mating individuals from two species, commonly from within the same genus. The offspring display tendencies and characteristics of each parents, but are regularly sterile, stopping gene drift among the species. Sterility is often attributed to the specific wide variety of chromosomes between the 2 species. For instance, donkeys have 62 chromosomes, horses have 64 chromosomes, and mules or hinnies have 63 chromosomes. Mules, hinnies, and other commonly sterile interspecific hybrids cannot produce feasible gametes, due to the fact differences in chromosome shape save you appropriate pairing and segregation throughout meiosis, meiosis is disrupted, and possible sperm and eggs are not shaped. However, fertility in lady mules has been pronounced with a donkey as the daddy.
  • A type of mechanisms restrict the fulfillment of hybridization, which includes the big genetic distinction between maximum species. Barriers encompass morphological variations, differing times of fertility, mating behaviors and cues, and physiological rejection of sperm cells or the developing embryo. Some act earlier than fertilization; others after it.
  • In flora, a few limitations to hybridization include blooming period differences, distinct pollinator vectors, inhibition of pollen tube growth, somatoplastic sterility, cytoplasmic-genic male sterility and structural variations of the chromosomes.

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