Huntington's disease is caused by an autosomal dominant allele. it is a lethal disease, but it persists in the human population. which of the following statements best describes why? a. huntington's disease is sex-linked and every human has at least one ; chromosome; thus, the chances are extremely high for this allele to be maintained in the human population. b. huntington's disease presents symptoms that resemble cases reflecting a lack of dominance in some individuals; in those cases, the allele is passed on to the offspring. c. while lethal to a parent, huntington's disease will not be lethal to the offspring since it can skip a generation. d. huntington's disease presents symptoms in humans after many have already reproduced; therefore, they are unaware that they passed on huntington's disease. e. huntington's disease can be treated in humans that are heterozygous for the condition, but individuals who are homozygous cannot receive treatments; thus, they pass on the alleles to their offspring.

Rease is an enzyme used by plants to break down urea (a nitrogen-containing compound) into carbon dioxide and ammonia. urease urea > > > carbon dioxide and ammonia ammonia is broken down by plants into a nitrogen source plants need to grow. thus, plants could not use urea as a nitrogen source unless it was first converted to ammonia. in soybean plants there are two different kinds of urease, one produced in the seeds and the other produced in the leaves of the plant. three types of soybean plants were used in a set of experiments: normal soybeans and two mutant strains, one lacking the urease in the seeds only (strain 1) and one lacking urease in the leaves only (strain 2). experiment 1 separate areas in a field were planted with normal, strain 1, and strain 2 soybeans. all types of soybeans appeared to grow, flower, and produce seeds equally well. there were no externally detectable differences among the strains. experiment 2 small pieces of plant leaves of equal weight were obtained from each type of soybean plant and separately placed on media in culture dishes. tissue growing in this way will become an unorganized clump of cells referred to as callus. to provide a controlled nitrogen source, half the tissue samples of each type were placed on media containing urea, and the other half of the samples were placed on media containing ammonia. after 30 days, the weight gain for each of the callus samples was determined. results are shown in the table below.

Why does bubbling occur when vinegar mixed with baking soda

When fossil fuels are burned, carbon dioxide is released. how does this gas impact the environment?