What part of the squid is homologous to the snail foot?
A. Fins
B. Mantle
C. Beak
D. Tentacles
Ans: D. Tentacles
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Which of the following statements about homeotic genes is true? a. All homeotic genes encode enzymes for metabolic pathways that produce pigments affecting eye and body color
b. All homeotic genes encode transcription factors with a homeodomain that can bind to a promoter. c. Homeotic genes encode enzymes that allow Drosophila to break down and digest fructose. d. Homeotic genes are believed to have evolved recently as they are not interchangeable between most species.
Without knowing the genetic basis, humans have selectively bred for:
a) increased body size in cattle. b) transgenic tomatoes. c) increased milk production. d) both a) and b). e) both a) and c).
The Drosophila regulatory segment that defines the location of Eve stripe 2 contains binding sites for four different transcription regulators: two repressors (Giant and Krüppel) and two activators (Bicoid and Hunchback). For Eve to be efficiently expressed in stripe 2, both repressors must be absent and both activators present. What would you expect to see in flies that lack the gene that encodes Bicoid? (Assume that Bicoid does not influence the expression of Hunchback, Giant, or Krüppel.)
A. Stripe 2 would become narrower. B. All 7 stripes would disappear. C. Stripe 2 would become fainter. D. Stripe 2 would expand toward the tail of the embryo. E. Stripe 2 would expand toward the head of the embryo.
What is a social group?
a. Individuals that are always together. b. Conspecific individuals that affect each other's fitness. c. A group that forages together. d. A group that shares communal raising of offspring.