Plasma cells, differentiated from B lymphocytes, are the factories that produce and secrete large amounts of antibodies (immunoglobulins) specific to an antigen. Macrophages phagocytose, T cells regulate or directly kill, neutrophils phagocytose bacteria.
Explanation:
Cross: TT × Tt. Gametes: T (from TT) and T or t (from Tt). Offspring genotypes: TT and Tt. Both express the dominant phenotype because the recessive allele t is masked by T. No tt offspring are produced, so 0% show the recessive trait.
Explanation:
Cloning produces genetically identical copies of a DNA fragment (molecular cloning) or an entire organism (reproductive cloning). Hybridization is crossing different varieties, mutation is change in DNA, transformation is DNA uptake.
Explanation:
Monocot stems have numerous vascular bundles scattered in the ground tissue. They are closed (lack cambium), collateral, and hence do not undergo secondary growth. Dicot stems have vascular bundles arranged in a ring, open (with cambium) allowing secondary growth. Radial vascular bundles are characteristic of roots. Scattered bundles are a key identifying feature of monocots.
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