top-rated free essay

Zoology Midterm Study Guide

By collin52 May 14, 2014 652 Words
4. SEX-LINKED INHERITANCE
autosomes—22 pair in people
heterosomes—1 pair in people (XY sex chromosomes)
XX=female XY=male
Red-green color blindness in people:
PREVIOUSLY NOTED FROM TUESDAY SEPTEMBER 3, 2013

5. No dominance example
homozygous black= black chicken
homozygous white= white chicken
heterozygous= gray

6. Multiple factors
Several sets of alleles on entirely different chromosomes affect the expression of a single characteristic. Skin color in people
Stature on people
Crop yield

7. Inheritance of sex (heterosomes)
female XX
male XY

8. Sex influenced characteristics
dominant in male
recessive in female
baldness in people
horns in cattle
9. Linkage
Genes for different characters together on the same chromosome Thus gene segregation and independent assortment is impossible Crossing over can separate these genes
Chromosomal maps

Changes in genetic traits due to mutations:
1. Chromosomal mutations (altered karyotypes)
Down syndrome
Retarded mental/physical development
Extra chromosome 21 (3n) triploid
Other karyotypic mutations
Inversions translocations
Deletions duplication
2. Gene mutations (chemical changes in genes on chromosomes) a) radiation (x-rays, ultraviolet, cosmic rays, radioactivity) b) chemical (complex hydrocarbons in the environment)
(mutation rate is low, only one per person)
GENES—the hereditary units on chromosomes
Genes consist of DNA (deoxyribosenucleic acid) molecules having the following components: 1. Nitrogenous bases
ring compounds
lots of N, C, H, often O
Purines (double ring)
A—adenine (double bond)
G—guanine (triple bond)
Pyrimidines (single ring)
T—thymine (double bond)
C—cytosine (triple bond)
TA GC
2. Nitrogenous bases are attached to a ribose (pentose) sugar lacking one oxygen 3. Sugars with their bases held together in a long string by phosphate (PO4) molecules 4. Whole long ladder-like structure twisted into a double helix

A nucleotide is a unit of both a DNA and RNA molecule consisting of a nitrogenous base, its ribose sugar and phosphate molecule. RNA (ribosenucleic acid) is transcribed by DNA contains the information for protein synthesis stored in the DNA One more ribose oxygen than in DNA

Has uracil (U) replacing thymine (T)
Kinds of RNA: (nucleolus to cytoplasm)
mRNA—messenger RNA: codon (boss)
tRNA—transfer RNA: anticodon (worker)
rRNA—ribosomal RNA (assembly line)

Genetic Code:
4 letter alphabet (4 nitrogenous bases) TACG
3 letter words (codons & anticodons)
20 meanings (20 amino acids)
arranged in long nucleotide sentences

the big picture (how it works_
1. DNA has genetic information
2. DNA copies information to 3 RNA types
3. mRNA and other types seep through nuclear pores into the cytoplasm 4. Cytoplasm contains the amino acids held by tRNA chunks (eat> gut> blood> cells) 5. mRNA and tRNA are joined by rRNA

6. Amino acids from tRNA guided by mRNA
7. The proteins are the enzymes that catalyze metabolic processes and make us what we are

one gene-> one enzyme theory (was hypothesis now a proven fact or Law of Nature)

Genetic Engineering
One example—making bacteria produce human insulin (diabetes) 1. Cleave genes at specific base sequence locations using one of the bacterial restriction endonuclease enzymes 2. Splice insulin gene into bacterial plasmid (circle of genes outside main chromosome) 3. Reproducing bacteria now produce insulin of the human type

gene repair engineering a similar process when introducing normal non- mutated genes, and so is adding….

EVOLUTION
organic evolution is the evolution of organisms and is defined: various organisms that exist today were derived from ancestral forms through progressive change in structure and function. Greeks knew fossils were ancient dead beasts but did not make much of it Erasmus Darwin (Darwin’s grandfather)

Lamark (French)—inheritance of acquired traits (strength, mouse tails, and inheritance) “The Voyage of the Beagle” 1831-1836 (Brit)
Charles Darwin & Robert Fitzroy in their 20s
European museum full of worldwide specimens
Charles Darwin, Alfred Wallace 1858
Darwin followed with many books

Steps in the process of organic evolution:
1. Organisms have high biological potential (reproductive rate) 2. They reproduce rapidly enough to overcome their limited resources (food and space) 3. Environmental resistance ensues (overcrowding)

4. Struggle for existence results
5. Genetic variation exists in species thus providing inherited traits 6. Natural selection favors the best traits
7. Survival of the fittest having the most advantageous traits (fitness is leaving the most genes)

Cite This Document

Related Documents

  • Vertebrate Zoology Study Guide

    ...Vertebrate Zoology Study Guide I. Taxonomy 1. Reasons for Taxonomy a. means of providing a systematic framework with which to work when studying the varied life forms inhabiting this earth b. establishes order from chaos c. Provides a system of nomenclature with which you label items (organisms) d. necessary when imagining trying to g...

    Read More
  • Study guide

    ...1. What nursing action is required b4 you measure fundal height= empty bladder full bladder make the fundal height higher. 2. What should a nurse do to prevent heat loss from evaporation= dry them up and remove the wet linen. 3. Child with cephalohematoma. What condition is associated with cephalohemetoma = jaundice 4. Why do we perform gesta...

    Read More
  • Management Midterm Study Guide

    ...BUS136 Intro to Management Midterm Topics of Emphasis Management, Meeting and Exceeding Customer Expectations by Plunkett, Allen and Attner Management (Pg4) One or more managers individually and collectively setting and achieving goals by exercising related function (planning, organizing, staffing, leading, and controlling) and coordinating...

    Read More
  • Midterm Study Guide

    ... The Study of Celestial Objects When we were born, we did not know how vast the world really is, we were convinced that this Earth was the center, the only place in this world. However, growing up we come to accept that Earth is just a piece of the infinite universe, and one might even say Earth is not even an atom compared to the cosmos. ...

    Read More
  • Apush Midterm Study Guide

    ...Abigail Adams | Accomplishments of the First Congress | Albany Plan of Union | Alexander Hamilton | American Revolution (Major battles, turning points) | American System of Manufacturing | Articles of Confederation (successes, failures/weaknesses) | Bacon's Rebellion | Boston Massacre | Boundaries of America (1783, 18...

    Read More
  • Midterm Study Guide

    ...Chapter 1 1. Briefly describe how outsourcing and strategic alliances have impacted IS organizations. Page Ref: 9 2. Describe the key differences between procedure-based information work and knowledge-based information work. Page Ref: 18 Procedure-based information work consists of high volume, low cost (per transaction), and wel...

    Read More
  • FIN560 Midterm Study Guide

    ...FIN560 Midterm Study Guide YOU MAY WANT TO PRINT THIS GUIDE. 1. The Midterm is open book, open notes. The maximum time you can spend in the exam is 2 hours and 30 minutes. If you have not clicked the Submit for Grading button by then, you will be automatically exited from the exam. In the Final Exam environment, the Windows clipboard is disab...

    Read More
  • Yoga midterm study guide

    ... Yoga → Sanskrit word “yuj” : to yoke, unite, join Refers to union of the individual self with the universal self. Union of the mind, body, spirit. → Philosophical or mystical system found in India; some dates the beginning of yoga back to Shamanism from 25,000 BCE, pre-dating written history. → 4 main yoga systems: Jnana Yoga...

    Read More

Discover the Best Free Essays on StudyMode

Conquer writer's block once and for all.

High Quality Essays

Our library contains thousands of carefully selected free research papers and essays.

Popular Topics

No matter the topic you're researching, chances are we have it covered.