The gastrointestinal system and many other internal organs are formed by the_______.
a. endoderm
b. mesoderm
c. ectoderm
d. trophoblast
a. endoderm
The gastrointestinal system and many other internal organs are formed by the endoderm.
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PKU detection includes
a. prenatal karyotyping. b. urine analysis at puberty. c. blood tests at puberty. d. saliva tests. e. urine analysis and blood tests at birth.
Maternal effect genes form gradients in the developing egg of chemicals called:a
maternal Hox proteins. b. segmens. c. differens. d. morphogens. e. maternal growth factors.
One predicted aspect of climate change is that climates, including precipitation and temperature, over most of the Earth will become more variable. Which of the following is a good crop genetic engineering strategy if this is true?
A) Only plant crops that are genetically engineered. B) Genetically engineer most crops to withstand very long droughts. C) Genetically engineer several genotypes within single crop types. D) Genetically engineer the fastest growing crops possible.
When is genetic testing for sex determination valid?
a. In cases of severe sex-linked disorders for which no genetic test is yet available. b. Simply becasuse the couple wants a child of a particular sex. c. In order to have the “right” child. d. When the ultrasound has been inconclusive.