3. Biology and Behavior 1/2 Flashcards
Nature and nurture Behavior genetics
Genome
The complete set of DNA of any organism, including all of its genes.
Genotype
The genetic material an individual inherits - the genes inherited at conception from one’s parents.
Phenotype
The observable expression of the genotype, including both body characteristics and behavior. Only some of the genes from the genotype are expressed in the phenotype. Whether or not the genes are expressed in the phenotype, is a function of dominance patterns.
Environment
Every aspects of individuals and their surroundings, other than the genes themselves. The eventual outcome of a given genotype is always contingent on the environment in which it develops.
Which five relations are fundamental in the development of every child?
- Parents genotype - Childs genotype
- Childs genotype - Childs phenotype
- Childs environment - Childs phenotype
- Childs phenotype - Childs environment
- Childs environment - Childs genotype
Chromosomes
Molecules of DNA that transmit genetic information. made up of two twisted strands of DNA. The nucleus of every cell in the body contains chromosomes.
DNA
Molecules that carry all the biochemical instructions involved in the formation and functioning of an organism.
Genes
Sections of chromosomes that are the basic unit of heredity in all living things. The instructions from the DNA are packaged in genes. Each gene is a segment of DNA that is the code for the production of particular proteins.
Hvor mange kromosomer har mennesket totalt i hver celle, og hvordan er de strukturert?
Mennesker har til sammen 46 kromosomer, delt inn i 23 par, i kjernen av hver celle (nukleus). Hvert par bærer gener av samme type - altså sekvenser av DNA relatert til de samme trekkene.
What are two mechanisms that promote variability among individuals?
Crossing over and mutation.
Crossing over
The process by which sections of DNA switch from one chromosome to another.
Mutation
A change in a section of DNA. Some mutations are random errors, others are caused by environmental factors.
Sex chromosomes
The chromosomes (X and Y) that determine an individuals designates sex at birth. These chromosomes are an exception to the general pattern of chromosome pairs.
What combination of the sex chromosomes does a male and female have?
Male: XY
Female: XX
Why does the genetically male parent always determine the genetic sex of the offspring?
Since a female does only have X chromosomes, the division of her germ celles will result in all her eggs having an X. However, because a male is the combination of XY, half his sperm will contain an X chromosome and the other half contain a Y.