Mod 3: Prenatal Development Flashcards
Male Gamete
Sperm - produced in testes
Female Gamete
Ova - stores in ovaries
How long does it take the ovum to mova from the fallopian tube to the uterus?
3 to 4 days
How many sperm are released at ejaculation?
Thousands
How many sperm makes it to the egg?
One
How many chromosomes do normal human cells have?
46
How many chromosomes do gametes have?
23
Allele
Specific version of a gene
Genetic variability allows for…
Genetic adaptation
Phenotype
Physical characteristics
Genotype
Genetic makeup
XY
Genetically male
XX
Genetically female
Autosome
Chromosomes that are not sex chromosomes
Mutation
Sudden, permanent change in a gene
Duplications
Portion of chromosome duplicated
Extra genetic material
Charcot-Marie-Tooth Disease Type 1A
Chromosomal Abnormalities occur when
A child inherits too many or not enough chromosomes
Most common cause of chromosomal abnormalities
Age of mother
Chromosomal abnormalities are believed to occur when
Ovum is ripening
Deletion
Portion of the chromosome is mising or deleted
Deletion
Portion of the chromosome is mising or deleted
Hirschhorn syndrome
Partial deletion of the short arm of chromosome 4
Jacobsen syndrome
terminal 11q deletion disorder
Translocations
portion of one chromosome transfered to another chromosome
Inversions
Portion of the chromosome has broken off, turned upside down, and reattached
Insertions
part of chromosome has been deleted from normal place and inserted into another chromosome
Rings
portion of chromosome has broken off and formed a circle or ring
Isochromosome
formed by mirror image copy of a chromosome segment including the centromere
Chromosomal abnormality on #23 is…
sex-linked
XXY, XYY, XXX, XO or 45 or 47 chromosomes
Turner’s syndrome
Ovum that lacks a chromosome is fertilized by an x-sperm
XO
affects cognitive function and sexual maturity
1 in 2,500 live female births
What is part of prenatal testing?
Prenatal screening and prenatal diagnosis
What is part of prenatal testing?
Prenatal screening and prenatal diagnosis
Pretnatal screening
Finding problems among a large population
Affordable and non-invasive
Prenatal Diagnosis
Gaining more detailed information once a problem has been found
more invasive
Prenatal Diagnosis has a high…
miscarriage risk
The Epigenetic Framework
describes psychologicsl development as a result of bi-directional interchange between nature and nurture
Erik Erikson believes that we developed…
Theough personality unfolding in predetermined stages
Behavioral Genetics
Science of how genes and environments work together
Adoption study
We can compare ˍˍˍˍˍˍˍˍˍ and ˍˍˍˍˍˍˍˍ twins to analyze nature and nuture
monozygotic; dizygotic
Monozygotic
Idential twins, zygote/egg splits apart in first two weeks of development
Dizygotic
Fraternal twins, 2 eggs released and fertilized by differeny sperm
Placenta
Temporary Organ that connects fetus to uterine wall via umbilical cord
Functions of the Placenta
Nutrient uptake, thermo-regulation, waste elimination, gas exchange via mother’s blood
Amniotic sac
Layer of membranes that hold embryo before birth