If both parents express a particular trait, but their child does not, what does this indicate about the trait?
a. The trait is an autosomal recessive trait.
b. The trait is an autosomal dominant trait.
c. The trait is sex-linked recessive
d. The trait is sex-linked dominant.
Answer: b. The trait is an autosomal dominant trait.
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A cDNA library differs from a genomic DNA library in which way?
A. It consists solely of RNA molecules B. It contains many copies of the gene of interest C. It contains only coding sequences, not introns D. It is typically 10-100 times the size of a DNA library
Endosperm is
A. sperm after it has entered the archegonium. B. nutritive tissue produced within antheridia. C. sperm cells enclosed within pollen grains. D. tissue stored in seeds that provides nutrition for embryos. E. sperm produced at the end of the flowering season.
Dating to about 3.5 to 3 million years ago, the famous fossil "Lucy," found in northern Ethiopia, represents a member
of ____.
a. Homo habilis b. Homo erectus c. Australopithecus africanus d. Australopithecus afarensis e. Homo neanderthalensis
New mothers may benefit from the aid of lactation consultants when learning to breastfeed. These consultants give advice on technique, and help the mother to feel relaxed and confident. What hormone is associated with calm, warm emotions and is also critical for the milk let-down reflex?
A. prolactin B. estradiol C. oxytocin D. mammotropin