In X-linked inheritance, the gene for albinism is located on an X chromosome. If the father has albinism and mother is normal, the chance for the child to be a normal carrier (genotype) is:
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%
Ans: c. 50%
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Which statement regarding the cornea is not true?
A. The cornea lacks blood vessels (it is avascular). B. The cornea lacks nerves (it is aneural). C. The internal corneal epithelium obtains oxygen from fluid in the anterior chamber of the eye. D. The external corneal epithelium receives nourishment from lacrimal gland secretions. E. The cornea serves to refract light rays.
Which of the terms below includes all structures that develop from a zygote
the embryo, the embryonic placenta and its associated membranes? a) Conceptus b) Primordium c) Epigenesis d) Gestational age e) Karyotype
The process of fertilization forms (the)
A) zygote. B) blastocyst. C) conception. D) gametes. E) None of the answers are correct.
This muscle must be consciously relaxed during defecation in order to decrease the bend of the anorectal junction and permit easy passage of feces through the rectum.
A. Pubococcygeus B. Puborectalis C. Iliococcygeus D. Coccygeus E. External anal sphincter