Answer:
because
Explanation:
Destiny of the ice is less than density of water.so, it's float
D.cyanobacteria hop that this helps some
Answer:
Abstract
Down syndrome (DS) is associated with aberrations in genetic, morphological, biochemical and physiological characteristics. A number of genes located on human chromosome 21 (HSA21) encode proteins which are thought to be involved in numerous metabolic pathways, e.g., phosphofructokinase, cystathionine β-synthase etc. Perturbations of the metabolic pathways may lead to altered drug metabolism in DS individuals. We present a review of metabolic aberrations linked to HSA21 genes in DS. We particularly focus on drug disposition, efficacy, sensitivity and toxicity of anti-leukaemic agents including methotrexate, glucocorticoids, anthracyclines and cytarabine in DS leukaemia. The different outcomes of therapy due to differential drug response, varied drug toxicity and treatment related mortality in DS leukaemia is a subject of much research and speculation. Altered drug response in DS individuals may stem from differences in pharmacokinetics, pharmacodynamics and pharmacogenetics. Further large-cohort studies in different age groups dissecting metabolic and molecular pathways involved in drug response may increase our understanding in this regard and stipulate pharmacotherapies in DS.
The sporophyte generation of a moss dependent on the gametophyte generation is that it is used for support and most of its nutrients.A sporophyte is the diploid multicellular stage in the life cycle of a plant or alga and it<span> develops from the zygote produced.</span>
Answer:
Some of the advantages of allopolyploidy over autopolyploidy are:
1. Allopolyploids generate a different set of gametes due to allelic diversity as they originate from distinct parental species. On the other hand, autopolyploids do not generate different sets of gametes as they originate from similar parental species.
2. Allopolyploids demonstrate heterozygosity, while autopolyploids show homozygosity.
3. Asexual reproduction of allopolyploids is more effective in comparison to diploid selfing as they possess gene diversity, while selfing in autopolyploids is not as effective as they comprise alleles, which are copies of each other.
Some of the disadvantages of allopolyploids over autopolyploids are as follows:
1. The hybrids of allopolyploidy are generally sterile, for example, mule produced by the mating of female horse with male donkeys. On the other hand, autopolyploidy exhibit homozygosity so their hybrid is generally fertile.
2. Allopolyploidy generates unbalanced number of chromosomes in the zygote like in triploid conditions that may be lethal. While autopolyploidy takes place because of genome duplication, thus, chromosome numbers are balanced.