Organisms that have two identical alleles for a particular trait are said to be

a. hybrid.

b. homozygous.

c. heterozygous.

d. dominant.

During which phase is the dna duplicated

You are given a metaphase chromosome preparation (a slide) from an unknown organism that contains 12 chromosomes. Two that are clearly smaller than the rest appear identical in length and centromere placement.

Opening of sodium channels in the membrane of a neuron results in A) depolarization. B) repolarization. C) hyperpolarization. D) increased negative charge inside the membrane. E) none of the above

What type of stress causes a normal fault?

Write down symbols for the alleles. (These may be given in the problem.) When represented by single letters, the dominant allele is uppercase and the recessive is lowercase.

What is the cause of Angelman Syndrome? a) A mutation that occurs randomly after birth or due to a viral infection in the mother during pregnancy. b) The shutting off of the paternal chromosome and the deletion on Chromosome 15 from the mother.

Which of these is a relationship shown in Carla's food web? about surface water is most useful for explaining this observa

Match each term to its scientific definition. 1.) natural world- 2.) theory- 3.) scientific method- A. everything that can be observed or explained scientifically. B. the procedure of scientific inquiry used to investigate natural phenomena. C.

The largest component of air is

Which statement is one of the three parts of a cell theory