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Sympatric speciation can be regarded as speciation where parent species gives rise to a daughter species without the individuals of a species being separated by space or territory. Both instantaneous and gradual models of sympatric speciation have been proposed. Barring one mode of instantaneous speciation by a mechanism known as polyploidy, other modes of sympatric speciation have remained quite controversial. Polyploidy is quite common among plants. (For a detailed discussion on polyploidy refer to Unit 10 of Block 2 of LSE-03 of Genetics course). A cross between two diploid plants could result in a tetraploid hybrid. The hybrid would remain largely reproductively isolated from its diploid parents. The reason for such isolation is that due to back-crossing if a triploid individual were to be formed, it will produce a high proportion of nonviable gametes. There is also a possibility that interbreeding between deploid and tetraploid forms or between different tetraploids may give rise to other polyploids.
Which type of genetic disease can be identified from the visual analysis of the number of chromosomes present in a karyotype? The counting and the identification of chromosomes
What is reproductive isolation? The Living beings are considered under reproductive isolation when they cannot cross among themselves or if they can cross but cannot generate f
Determine the Emerging clinical use of brain Emerging clinical uses include identifying brain regions from which epileptic seizures emanate and confirming diagnoses of neurodeg
BIOLOGY - A SCIENCE OF EXCEPTION - Some common examples to prove it are - 1. Embryos of dicot plants have 2 cotyledons but in cuscuta (Dodder plant or amer bel or Aka
why are the microspores in groups of four?
If dimples may be considered a single-gene dominant trait, and 64% of the population features dimples, calculate the frequencies of heterozygotes and both types of homozygotes, ass
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When ATP gives energy to the cellular metabolism it loses one of its phosphates and ADP reappears. ADP can also lose more phosphates and produce AMP (adenosine monophosphate) o
Compare and contrast enantiomers, epimers, and anomers, specifically in relation to sugars.
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