In addition to the three common alleles of gene I, the ABO blood type is controlled by a second gene, gene H. Individuals with at least one copy of the wild-type H allele produce substance H, a sugar polymer, on the surface of their red blood cells. Substance H is the precursor molecule to which the A and B polysaccharides are attached by the products of gene I. Individuals with the genotype hh do not have Substance H on their red blood cells, and so even if they have an IA or IB allele, the A and B polysaccharides cannot be attached to the red blood cell surface. Therefore, hh individuals appear to have blood type O regardless of their gene I alleles. This phenomenon, called the Bombay phenotype, can result in surprising pedigrees like the one shown. Examine this pedigree, then classify each statement as either true or false.

the answer is b: 1.4 km/hr

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation: