Describe the stages at which genetic sex, gonadal sex, and phenotypic sex are established What will be an ideal response?
The sex of an individual is formed in three stages. The first stage—chromosomal sex—
occurs at fertilization with the formation of a zygote with either an XX or XY chromosome
pair. During the second stage, in males, the undifferentiated gonads develop into testes and in females, they develop into ovaries. During the third stage in males, testosterone (converted
into DHT) directs the formation of the penis and scrotum. In females, no DHT is present, and
the genital tubercle develops into the clitoris, the genital folds form the labia minora, and the
labioscrotal swellings form the labia majora
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A research group led by Li Li has found a(n) ____ that potentially can be used in uranium
bioremediation.
a. amoeba b. plant c. alga d. bacterium e. fungus
Which part of the central nervous system is located within the vertebral canal?
A. brain B. spinal cord C. ganglion D. cerebellum
Only mammals produce hormones
Indicate whether the statement is true or false
Which type of organism gets energy from breaking down nutrients and uses CO2 as a carbon source?
A) lithotroph B) chemoautotroph C) photoautotroph D) chemoheterotroph E) photoheterotroph