The chorionic villi eventually form the placenta, a disc-shaped structure that ____
a. releases sex hormones at appropriate times throughout pregnancy
b. initiates uterine contractions
c. binds to the zygote to accelerate organ development
d. nourishes the embryo throughout pregnancy
e. prevents infection by blocking the passage of microorganisms through the cervix during pregnancy
d
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Which of the following processes does not generate genetic variation during sexual reproduction?
A. Crossing over B. Random fertilization C. Independent assortment D. All of the processes above generate genetic variation
Which of the following is an exocrine gland
that secretes mucus into semen?
a. prostate b. seminal vesicle c. bulbourethral d. epididymus e. vas deferens
Chromosome pairs numbered 1 through 22 are classified as
a. centrosomes. b. somatosomes. c. sex chromosomes. d. autosomes. e. corposomes.
Which embryonic tissue is incorrectly associated with its derivative?
A. Skin; ectoderm B. Nervous system; ectoderm C. Liver; endoderm D. Circulatory system; mesoderm E. Brain; mesoderm