One out of every 800 to 1000 infants born will have three copies of chromosome 21 (trisomy 21), a condition known as ________
Fill in the blank(s) with correct word
Down syndrome
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All of the following are found in bacterial cells EXCEPT
a. ribosomes. b. genetic material. c. cell wall. d. mitochondria.
Discuss the advantages of a closed circulatory system, compared to an open circulatory system
What will be an ideal response?
Dr. Doe designs an experiment to test whether hummingbirds prefer red flowers over white. He places a hummingbird in an aviary with one flower of each color and counts the number of times the hummingbird visits each. What be an acceptable null hypothesis for this study?
A. There is a difference in the number of visits between the red and white flowers B. Hummingbirds prefer red flowers over white C. There is no difference in the number of visits between the red and white flowers D. Hummingbirds prefer white flowers over red
Respond to the following statements in reference to the five stages or structures involved in the development of the human egg. Answers may be used more than once or not at all.
A. This diploid germ cell produces primary oocytes by mitosis. B. Human females are born with about 2 million of these cells that entered meiosis but stopped in prophase I. C. This cell becomes the mature egg only after fertilization in humans. D. This cell is the first sex cell stage to be in the haploid state. E. This cell contains a haploid set of chromosomes but will never be fertilized; often disintegrates and is reabsorbed in the body. F.