In an experiment, rats' ovaries were removed immediately after impregnation and then the rats were divided into two groups. Treatments and results are summarized in the table above
The results most likely occurred because progesterone exerts an effect on the _____. A) general health of the rat
B) metabolism of the uterus
C) gestation period of rats
D) number of eggs fertilized
B
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The process occurring at point 3 in Figure 29-2 is:
a. asexual reproduction.
b. fertilization.
c. meiosis.
d. mitosis.
e. zygote germination.
Which of the following alleles is most likely to decrease in frequency in a population?
a. an allele that resulted in osteoporosis b. an allele causing infertility c. an allele that resulted in reduced intelligence d. an allele that results in Alzheimer's disease
The proper order of embryonic development is
A. morula-cleavage-blastula-gastrula. B. gastrula-cleavage-blastula-morula. C. cleavage-morula-blastula-gastrula. D. blastula-cleavage-morula-gastrula.
Elephantiasis is a tropical disease where small nematode larvae block the lymphatic ducts. As a result, the legs become large like those of an elephant and the scrotum and arms may also swell. This problem would be a severe form of
What will be an ideal response?