The rapid diversification of species seen in the fossil record followed by long periods of stasis is part of the ________ model of evolution
A) punctuated equilibrium
B) symmetric
C) spatial
D) graduated
A
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Because carbon is able to form four covalent bonds, it can form a huge variety of structures, including linear, ________, and ________ molecules
Fill in the blank with correct word.
Drosophila (fruit flies) usually have long wings (+) but mutations in two different genes can result in bent wings (bt) or vestigial wings (vg). If a homozygous bent wing fly is mated with a homozygous vestigial wing fly, which of the following offspring would you expect?
A) All +bt +vg heterozygotes B) 1/2 bent and 1/2 vestigial flies C) All homozygous + flies D) 3/4 bent to 1/4 vestigial ratio E) 1/2 bent and vestigial to 1/2 normal
Which of the following statements accurately describes prophase?
a. The cell appears to have a line of chromosomes across the midregion. b. The nuclear envelope becomes visible. c. The cell constructs microtubules to form a spindle. d. Chromatids separate and become known as chromosomes.
Which one of the following x-linked disorders is caused by an abnormal number of repeat sequences in the genome and is the most common cause of inherited mental impairment?
A) fragile X syndrome B) Klinefelter syndrome C) Williams syndrome D) cri du chat syndrome E) Down syndrome