Which of the following is a phase of the menstrual
cycle?
a. follicular phase
b. luteal phase
c. ovulation
d. all of these
e. none of these
Answer: d
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A polygenic trait is influenced by the effect of several genes. Although one or more of these may be major genes, many others with lesser effects are known as what type of gene?
What will be an ideal response?
A field of wildflowers contains approximately equal numbers of red, yellow, and white flowers. A fire moves through the field and kills most of the red and yellow flowers, but leaves a small population of white flowers undisturbed. The following year, most of the flowers that grow in the field are white. Which process has resulted in the random change in the genetic makeup of the flower population?
A) gene flow B) stabilizing selection C) genetic drift D) directional selection
Which of the following is TRUE in the Watson-Crick model of DNA?
A) Four different types of bases are found in DNA. B) Phosphate groups always bond to ribose. C) Ribose always bonds to a nitrogenous base. D) The number of adenines equals the number of guanines. E) During replication, the phosphate groups are copied but the base sequence is not copied.
The ____ is a hormone produced by specialized cells in the heart in response to high blood pressure
a. atrial natriuretic factor b. renin c. aldosterone d. antidiuretic hormone e. angiotensin