Traits Of Living Things

Dogs have 78 chromosomes in each body cell.  How many chromosomes did it get from each of his parents (gamete)?

Kevin observes a frog.  Which statement is NOT an observation?

• Its skin is smooth.

• It will live at least 15 years.

• Its long legs help it jump far.

• Its webbed feet help it swim.

Any trait that helps an individual to survive in its environment is a(n)

The order of the nitrogen bases in a DNA molecule determines an organism's

• Centromeres.

• Chromatids.

• Genes.

• Phophates

A change in DNA during replication is

• A hybrid.

• A mutation.

• A nucleotide.

• Reproduction.

A brown rabbit has one gene for brown coloring (G) and one gene for white coloring (g).  A white rabbit has two genes for white coloring (g).  What are the possible gene combinations of their off spring?

• GG and gg

• GG and Gg

• Gg and gg

• GG and Gg or gg

Which would be the BEST model of a DNA molecule?

• Stacks of wooden blocks

• A zipper that is slightly twisted

• Different sizes and colors of marbles

• A stretched metal spring toy

Body shape, haor and eye color, and the need for sleep are examples of manipulated traits.

• True

• False

In a classroom, 7 students have attached earlobes, and 21 have detached earlobes.  What fraction of students in the classroom have attached earlobes?

• 1/7

• 1/5

• 1/4

• 1/3