Heredity, Prenatal Development, and Birth Flashcards
Genes
Biology break
all living things are made up of cells
humans have around 23,000
chemical recipes for every aspect of human development
affect everything but determine nothing
Gametes
Reproductive cells
sperm/ovum
23 chromosomes in each gamete cell
Zygote
Combine to form a single cell at conception
46 chromosomes in the cell
DNA Molecules
genetic material
organized into genes
stored on chromosomes
each person is supposed to have 23 chromosomes from each parent
Genome
entire set of DNA instructions found in cells that make up a living organism
Genotype
genetic interitance
receipt of alleles determines this
Phenotype
manifestation/expression of genotype
expression of alleles determines this (dominate or recessive)
Behavioral Genetics (epigenetics)
Environmental factors affect genes and expression
genes dictate life span
genes can modify based on the environment
outcome of genetic interaction is difficult to predict
Gene Expression
dominant gene-linked
recessive gene-linked
sex gene-linked
dominate trait
v-shaped hairline
almond shaped eyes
detached earlobes
dark hair
brown eyes
recessive trait
straight hairline
round eyes
left handedness
attached earlobes
blond or red hair
blue eyes
genetic disorders
run in families
heart diseases, asthma, diabetes, cancer, single gene disorders
-some are more noticeable
-some are health illness and some are mental health illness
-nobody is to blame
epigenetics
DNA is not your destiny
goes beyond genetic inheritance
enivornment plays a role
prenatal growth
most dramatic and extensive transformation of entire life occurs before birth
germinal, embryonic period, and fetal period
first two weeks-conception to implantation
week 3-central nervous system
week 4-heart and face
week5-arms and legs
week 6-hands and feet
week 7-fingers, toes, and inner organs
week 8- all boidly structures are in place
week 9-brain maturation and weight gain