Which of the following events occurs first during meiosis?
A. homologous chromosomes separate and are pulled to opposite poles of the cell
B. sister chromatids separate and are pulled to opposite poles of the cell
C. chromosomes decondense
D. synapsis of homologous chromosomes
E. pairs of homologous chromosomes align along the equatorial plate
D. synapsis of homologous chromosomes
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In the following list, pick the one that is NOT a source of genetic variability from meiosis and
fertilization.
a. recombination of homologous chromosomes b. segregation of chromosomes c. genes contained in the gametes that fuse to form a zygote d. recombination between sister chromatids e. physical arrangement of chromosomes along the metaphase plate in preparation for anaphase
A botanist brings you a leaf from a previously unknown species of plant. The shape of the leaf is eerily similar to a human hand, as if you had put your own hand down on green construction paper, and traced its outline. Starting from the petiole, veins branch out into each ‘finger’ of the leaf, with numerous smaller veins branching off within each finger. What is the most specific description you can assign to this leaf form?
a. compound b. palmately compound c. simple d. pinnately compound
The time it takes for half of the atoms in a radioisotope sample to decay is called the ____
a. decay time b. half-life c. isotopic life d. release time e. denature time
Mycoses are
A) toxins produced by fungi. B) fungal infections. C) the group of fungi which are primarily filamentous. D) allergic responses to fungal material.