A zygote forms when
A) the nucleus from the sperm fuses with the egg nucleus.
B) the sperm penetrates the zona pellucida.
C) the blastocyst begins to form.
D) the acrosomal cap is ruptured.
E) meiosis II in the secondary oocyte initiates.
A
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In humans a deletion from chromosome 5 typically leads to severe mental retardation and a malformed
larynx; this disorder is known as ____.
a. Turner syndrome b. Down syndrome c. cri-du-chat d. Triple-X syndrome e. Klinefelter syndrome
The sinoatrial node consists of a form of this tissue.
A. nervous B. muscular C. epithelial D. connective E. adipose
The site on a chromosome where a gene is located is called its ____
a. character b. marker c. locus d. trait e. homologue
The letter âFâ indicates the ____
a. mouth b. crop c. gizzard d. intestines e. cloaca