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Diplosporous development in Boehmeria tricuspis: Insights
Diplosporous development in Boehmeria tricuspis: Insights

... Most apomicts are polyploid, and apomixis has previously been proposed to be a consequence of hybridisation and/or genome doubling, i.e. the events of polyploidisation4. However, polyploidisation alone is not sufficient to induce apomixis, as not all polyploids are apomicts6. In fact, through dosage ...
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... In the above problem, none of the offspring will show the dwarf trait. As we learned earlier, Mendel wondered what had happened to the dwarf trait. He allowed the F1 generation to self-pollinate. Show this cross using the Punnett square below. ...
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... An allele is an alternative form of a gene located at a specific position on a specific chromosome, a DNA molecule. Alleles determine traits that can be passed on from parents to offspring. In many cases, a trait is determined by one pair of alleles—one allele from each parent. Complete dominance oc ...
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... single nucleotide mismatch in the middle of an siRNA can abolish its activity [1,2]. In contrast, another report indicates that siRNAs can silence non-target genes containing as few as 14–15 consecutive complementary nucleotides [3]. Therefore, until we reach a better understanding of siRNA specific ...
unique features of the plant life cycle and their consequences
unique features of the plant life cycle and their consequences

... of unknown role is required for meiotic-cell specification32. Several other loci that alter anther cell fate have been defined in Arabidopsis but are not yet cloned33, and, in maize, the multiple archesporial cells 1 (mac1) mutation disrupts the somatic-to-germinal switch in both male and female flo ...
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X-inactivation



X-inactivation (also called lyonization) is a process by which one of the two copies of the X chromosome present in female mammals is inactivated. The inactive X chromosome is silenced by its being packaged in such a way that it has a transcriptionally inactive structure called heterochromatin. As nearly all female mammals have two X chromosomes, X-inactivation prevents them from having twice as many X chromosome gene products as males, who only possess a single copy of the X chromosome (see dosage compensation). The choice of which X chromosome will be inactivated is random in placental mammals such as humans, but once an X chromosome is inactivated it will remain inactive throughout the lifetime of the cell and its descendants in the organism. Unlike the random X-inactivation in placental mammals, inactivation in marsupials applies exclusively to the paternally derived X chromosome.
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