Mammals are the only vertebrates to possessĀ
A. live birth.
B. a four-chambered heart with a pulmonary circuit.
C. single loop circulation.
D. endothermy.
E. hair.
Answer: E
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The goldenrod gall fly lays its eggs on the terminal buds of goldenrod plants
Larvae chew through the buds and into the stems, where their saliva induces the plant to generate a gall, or outgrowth of tissue that then provides food and shelter for the developing larva. The larvae are prey to both parasitoid wasps and to birds; wasps selectively prey on larvae inside the smallest galls while birds selectively prey on larvae inside the largest galls. Goldenrod gall flies are therefore subject to A. balancing selection. B. stabilizing selection. C. directional selection. D. disruptional selection. E. heterozygote advantage.
A transfusion reaction primarily involves
A. leukocytes. B. phagocytes. C. platelets. D. erythrocytes.
The original source of new alleles is
a. crossing over. b. independent assortment. c. fertilization. d. mutation. e. more than one of these.
Explain how X inactivation can result in female mosaicism and give examples What will be an ideal response?