The Human Genome Project (HGP) was an international scientific project spanning many years and involving hundreds of scientists. Its purpose was to determine the sequence of chemical base pairs that make up DNA and map all the human genes. This allowed researchers to compare sequences of human DNA to sequences of DNA from other organisms. From these comparisons, they could identify similar genes that may have similar functions. Which statement best explains why it is possible to make these types of comparisons of these DNA sequences? A. Virtually all organisms generate mutations that are passed on to their offspring.

B. The genetic code in virtually all organisms depends upon enzymes to form bonds.

C. Virtually all organisms replicate their genetic material prior to mitotic cell division.

D. The specific codons that code for a particular amino acid are common to virtually all organisms.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle

yes

no

blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.