If 2n = 20, how many chromosomes are present in each cell in prophase ii of meiosis?

Sarah turns over an empty beaker into a basin of water. She finds that the water cannot flow into the beaker. What can you conclude from her observatiom?

a. Homologous chromosomes recognize each other, aligning themselves along their entire lengths. b. A physical exchange of chromosome pieces that most commonly occurs during prophase of meiosis I c.

What is the name for the rocky upper layer of the solid earth? A. biosphere B. magnetosphere C. atmosphere D. lithosphere

Match the following terms and definitions 1. gene a portion of DNA which codes a specific heredity trait 2. allele alternate forms for a specific gene 3. trait a thread-like molecule in the nucleus composed of DNA 4.

Which trait would best indicate that a particular arthropod was a member of subphylum chelicerata? jointed appendages sexual reproduction terrestrial lifestyle two body segments compound eyes?

Archaea differ from bacteria in that archaea

Pyrimidines are synthesized through a long series of reactions beginning with the amino acid aspartate.

Polar climates normally get blank amounts of precipitation

What is a benefit of multicellular organisms that is not shared by single-celled organisms? All cells in a multicellular organism can perform all metabolic functions, thus maximizing metabolism. Single-celled organisms can form tissues.

What does it mean when you hear an owl in the daytime?