Chapter 38

Sexual reproduction among animals is ____________. a. biologically costly c. evolutionarily beneficial b. diverse in its details d. all of the above

A cell formed during cleavage is a ___________. a. blastula b. morula c. blastomere d. gastrula

_________ produces three primary tissue layers. a. Gametogenesis c. Gastrulation b. Implantation d. Pattern formation

Homeotic genes map out the _____________. a. cleavage planes c. basic body plan b. primary tissue layers d. all of the above

During a menstrual cycle, a midcycle surge of ___________ triggers ovulation. a. estrogens b.progesterone c. LH d.FSH

A ____________ implants in the lining of the uterus. a. zygote b. gastrula c. blastocyst d. fetus

Which of the following puts human developmental stages in the correct order? a. zygote, blastocyst, embryo, fetus b. zygote, embryo, blastocyst, fetus c. zygote, embryo, fetus, blastocyst d. blastocyst, zygote, embryo, fetus

Match each term with the most suitable description. _______gamete formation _______fertilization_______cleavage _______gastrulation _______cell differentiation _______morphogenesis a. mitotic cell divisions b. cellular rearrangements form primary tissues c. eggs and sperm form d. sperm nucleus and egg nucleus fuse e. orderly changes in body size and shape f. in most species, genes are now selertively artivated

Match each term with the most suitable description. _______testis _______cervix _______placenta _______vagina _______ovary _______oviduct _______epididymis _______endometrium a. maternal and fetal tissues b. stores mature sperm c. produces testosterone d. produces estrogen and progesterone e. usual site of fertilization f. lining of uterus g. birth canal h. entrance to uterus