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AP Bio Lab 7 - Genetics of Drosophila — bozemanscience

-- There are two major competing hypotheses for variation in clutch size among cavity-nesting species. The nest site limitation hypothesis postulates that nesting opportunities are more limited for weak excavators, which consequently invest more in each breeding attempt by laying larger clutches. Alternatively, clutch size may be determined by diet; the clutch sizes of strong excavators may be smaller because they are able to specialize on a more seasonally stable prey. Wiebe et al. (2006) built a conceptual model that integrated hypotheses for interspecific variation in clutch size and tested it with comparative data on life-history traits of woodpeckers (Picidae) and nuthatches (Sittidae). In most analyses, diet explained more variation in clutch size among species than did propensity to excavate. Migratory status was positively associated with clutch size, but was difficult to distinguish from diet because resident species consumed more bark beetles (a prey available in winter) and had smaller clutches than migratory species. The literature suggests that cavities are not limited in natural, old-growth forests. Although Wiebe et al.'s (2006) data do not rule out nest site limitation, the authors concluded that annual stability of food resources has a larger impact on the evolution of clutch sizes in excavators than does limitation of nest sites.

• What are the dependent and independent variables.How To Write A Null Hypothesis In Biology.


Hypothesis for the seasonal decline in clutch size at higher latitudes based on the seasonal decline in the reproductive value of the eggs
and on variation in female quality or condition. (A) The reproductive value of an egg declines seasonally because the probability of offspring
recruitment (surviving until reproducing) declineswith hatch date. (B) Attaining the physical condition needed to lay a clutch of a given size requires
time, and more time available means a larger clutch is possible. However, at a given date, females of higher quality or in better condition (thick solid line)
lay more eggs than those of lower quality or worse condition (broken line). (C) The product of the reproductive value of a single egg and the number of
eggs yields a fitness curve maximized by some intermediate clutch size. The clutch size that maximizes fitness is smaller for a late-breeding attempt (broken line)
than for an early breeding attempt (solid line), giving rise to a seasonal decline in optimal clutch size (thin, black, diagonal line in B)
(From: Rowe et al. 1994, Sockman et al. 2006).

AP Bio Lab 7 - Genetics of Drosophila

First | Previous (Null cells).S449 AP Biology Name _____ Lab 7: Genetics of Organisms 1 1.

Biologists collect data to test hypotheses. The hypothesis can either be accepted or rejected. The concept of hypothesis-testing will be the focus of the third part of today's lab.

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AP Biology Lab 7 - Genetics of Drosophila

Bio-Rad scientists.(H 1) and the null hypothesis and is the most foolproof guide to how to write a hypothesis.


Introduction to micro-organisms, particularly bacteria and viruses, with emphasis on health care-related applications of microbiology using case studies. Laboratory work includes aseptic techniques, methods of cultivating and identifying bacteria, demonstration of microbial properties and will provide practice with basic microbiological skills. Lecture three hours; laboratory three hours. Fee Course.


Introductory laboratory investigation of the major principles of biology, including properties of all living things, the unity and diversity of organisms, structure and function of cells, energy and metabolism, genetics, ecology, evolution, and the scientific methods of investigation employed by biologists. Laboratory three hours.

I am supposed to write a hypothesis about how much adipogenesis.AP Biology Formal Lab Report Guidelines c.
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Essay on Bio post lab 7 - 800 Words | Major Tests

Birds in tropical areas commonly lay about half as many eggs as those in north temperate areas. Lack (1947) proposed that latitudinal variation in clutch sizes was the result of differences in food availability. This food limitation hypothesis posits that clutch size is determined by food supply, with natural selection favoring clutch sizes that correspond to the number of viable young that the parent(s) can successfully raise, and the scarcity of food in tropical habitats limits clutch sizes. Another hypothesis, the nest predation hypothesis, proposes that small clutch sizes are favored in the tropics because there are more predators in the tropics and predators are more likely to locate nests with larger clutches and more young because more young mean increased rates of food delivery by adults and a greater likelihood that, with the increased activity, predators will locate nests. High rates of nest predation may also select for smaller clutches to reduce the investment in any single nesting attempt (Slagsvold 1982, Martin 1995). Field studies have provided little support for either of these hypotheses (Martin et al. 2000, Stutchbury and Morton 2008).

10/21/2007 · Ap bio lab write up answers

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