Polyploidy:a
may be the result of more than one sperm fertilizing an egg.
b. is not lethal in humans.
c. may be the result of the failure of a chromosome to separate during meiosis.
d. can be due to nondisjunction for a chromosome.
e. is the mechanism of dosage compensation
A
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The head of a sperm cell contains a specialized organelle called the ____ , which contains enzymes used to transverse the outer coating of the egg
Fill in the blank with the appropriate word.
Viral infection is a major cause of cancer
a. True b. False Indicate whether the statement is true or false
In which of the three vertical intertidal zones is biodiversity the highest, and why?
What will be an ideal response?
When all living organisms are included, which biomes contain about 70% of the biomass found on Earth's land surface?
A) forests B) grasslands C) tundras D) deserts