If a pedigree of several generations shows only females affected by a particular trait, it cannot be a(n) ____ trait

a. autosomal recessive
b. autosomal dominant
c. Y-linked
d. X-linked recessive
e. X-linked dominant


c

Biology & Microbiology

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Which immune system cells primarily function as antibody producers and originate from stem cells?

a. B lymphocytes b. T lymphocytes c. Natural killer cells d. Neutrophils

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What makes phospholipids good at forming cellular membranes?

A. Regions of aliphatic and hydrophilic atoms causing an internalization of phosphorous making a bilayer. B. The polar and non-polar regions create an amphipathic bilayer of phospholipids. C. Covalent and ionic bonds between glycerols create a tight seal around the cell. D. The three saturated fatty tails in phospholipids create a semi solid like structure that maintains a cell's shape.

Biology & Microbiology

The slender stalk that connects the flattened leaf blade to the stem in most dicots is the  

A.  meristem. B.  petiole. C.  stele. D.  receptacle. E.  vein.

Biology & Microbiology

Two types of polygamy are:

a. kin selection and reciprocal altruism. b. polygyny and polyandry. c. polygyny and monogamy. d. internal and external. e. isogamy and anisogamy.

Biology & Microbiology