A set of Mendelian crosses involving two traits is performed. The first cross is between a plant with green and wrinkled seeds and a plant with yellow and smooth seeds. The F1 all have yellow and smooth seeds. The 160 F2 have 5 plants with green and wrinkled seeds, 33 […]

Proflavin-induced wild-type revertants of a number of spontaneousmutants in ac+ gene of phage T4 were isolated. Proflavin induces frameshift mutations. The aminoacid sequence of the affected protein was analyzed in several of these revertants. The affectedstretch of amino acids is shown for one such pseudo-wild type revertant (also shown are the amino acidsin […]

Aphids can reproduce sexually and asexually. Females reproduce by themselves and give birth to live females in summer. They also reproduce sexually and lay eggs that survive in summer and eggs that survive in the winter and hatch in the spring. Often found on ornamental plants, aphids are among the […]

The extent of branching (number of ?1?6 glycosidic bonds) in amylopectin can be determined by extensive methylation followed by identification of the hydrolysis products of the methylated polysaccharide, as follows: A sample of amylopectin is exhaustively treated with a methylating agent (methyl iodide) that replaces all the hydrogens of the […]