Which of the following cell groups is responsible for all components of DiGeorge Syndrome?
A. Ectoderm
B. Endoderm
C. Mesenchyme
D. Neural Crest Cells
E. Pharyngeal Arch I Cells
Answer: D. Neural Crest Cells
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Consider an infertile couple, of which both partners are able to produce healthy gametes, but the woman's history of endometriosis has rendered her unable to carry a fetus. Suppose this couple undergoes IVF with their own gametes, followed by embryo transfer to the uterus of a gestational surrogate, and the birth of a baby. What is the genetic relationship between the surrogate and the baby?
a. The baby shares only X chromosomal DNA with the gestational surrogate. b. The baby shares 25% of its genes with the gestational surrogate. c. The baby shares half of its genes with the gestational surrogate. d. The baby is genetically identical to the gestational surrogate. e. There is no genetic relationship between the gestational surrogate and the baby.
In the axoneme, sidearms
A) are 10 protofilament incomplete microtubules attached to 13 protofilament microtubules. B) generate force to slide microtubules past one another. C) project toward the central pair from each outer doublet. D) link adjacent doublet microtubules to limit sliding. E) are complete 13 protofilament microtubules.
Suppose that at least one of your parents has Huntington's disease, which is caused by a dominant allele. What are the odds of you inheriting the disorder?
a. 100% b. 75% c. 50% d. 25%
Ringworm is caused by
A) worms infected with fungi invading the skin. B) dermatophytes that have invaded deep into the living tissue. C) dermatophytes growing in the outer dead tissue layers of the skin (epidermis). D) a hypersensitivity caused by superficial contact with dermatophytes. E) toxins produced by dermatophytes.