The lens of the vertebrate eye develops only after the head ectoderm comes in contact with the optic cup. This is an example of A)   Determination B)   Differentiation C)   Pattern formation D)   Induction

Even though Hardy and Weinburg showed that the process of random reproduction will not alter gene frequency in a population over time, in wild populations we observe that gene frequencies do change overtime so what has happened? A) sexual selection B) Evolution due to sexual selection C) none of these D) any of these E) Evolution due to genetic drift

Natural selection operates on: a) Individuals b) Ecosystems c) Populations d) Communities

How did Spiegelman et al.' s experiments in 1967 & 1970 on the origins of natural selection provide evidence for natural selection in an RNA-based world?     A) The starting RNA strand was originally ~4,000 nucleotides; after several serial transfers it was reduced to ~200 nucleotides as a result of faster replication of shorter sequences being advantageous and selected for.     B) The starting RNA strand was originally ~4,000; after several serial transfers and the introduction of additional RNA molecules it increased to ~20,000 nucleotides as a result of hybridization with the longer RNA molecules having outcompeted shorter RNA strands.     C) The RNA remained at approximately is original sequence of ~4,000 nucleotides, demonstrating fitness in a stable environment.     D) These experiments did not demonstrate natural selection.

1.) The process in which the genetic composition of a population changes with time is known as evolution. Which of the following mechanisms is not an agent of evolutionary change? A) natural selection B) mutation C) genetic drift D) random mating 2.) Which statement below is not consistent with a population in Hardy-Weinberg equilibrium? A) Genetic drift is occuring B) Random mating is occuring. C) Population size is large. D) Migration is not occuring.

6) Which mechanism can consistently produce "adapted" individuals through evolution?   A) Gene flow   B) Sexual selection   C) Natural selection   D) Genetic drift

Why do related species share homologous traits? Please choose all the FALSE options.  a) Related species have independently evolved homologous traits. b )Related species inherited homologous traits from a common ancestor. c ) Related species share homologous traits because they are found in the same geographical area. d) Related species have adapted to similar environments

Which is NOT an example of a structural homology? Please choose all applicable options. a) All vertebrate embryos form pharyngeal pouches.b) Vertebrate forelimbs generally have the same number and a similar arrangement of bones.c) The same group of embryonic cells forms the adult jaw of a perch and of a dog.d) All organisms share a common genetic code.

What do all of the species in this cladogram have in common? A) they are all in the Claude archea B) none of them will ever evolve anymore C) they all have a common line of ancestry D) each of them has opposable thumbs and fur

DO all of them please Multiple chpoice 11. Threshold concentration, morphogens, induction, and cell adhesion provide ________ to a developing organism.A) positional informationB) maternal effect genesC) homeodomainsD) lineage tracingAnswer: 12) What is the first stage of embryonic pattern development in Drosophila?A) limb positionB) body axesC) segmentation patternsD) metamorphosisAnswer: 13) A Drosophila larva that develops from an oocyte that has no bicoid mRNA will have what developmental defect?A) only ventral structuresB) no dorsal structuresC) only anterior structuresD) only posterior structuresAnswer: 14) The bicoid gene has what pattern of inheritance?A) sex-linkedB) incomplete penetranceC) maternal inheritanceD) autosomalAnswer: 15) A homeotic mutation results in which of the following?A) Incorrect formation of the body axesB) Replacement of segments with parasegmentsC) Replacing of one body part with anotherD) ApotosisAnswer: 16) Antennapedia in Drosophila is an example of a…