Term 2: Life transitions Flashcards
What is psychosocial development?
Social, emotional and personality changes
What is cognitive development?
Increasing ability to know, understand, remember, communicate and problem solve
What is a gene?
A unit of inheritance with a set of instructions to guide development and growth. Arranged in sequence on chromosomes and made up of DNA
What are the two types of chromosomes?
Autosomal and sex
How many pairs of chromosomes do people have?
23 pairs
What’s an autosomal dominant inheritance disorder?
Is present if the faulty gene is dominant.
50% chance of inheriting the disorder
What is an autosomal recessive inheritance disorder?
Disorder is present if person has 2 recessive genes. Person can be a carrier of the disorder but not have the affects.
For 2 carrier parents 25% chance child will be affected
What is an example of an autosomal recessive inheritance disorder?
Cystic fibrosis
What is physical development?
Growth and increasing capability to perform physical skills
What is the germination period?
First two weeks after conception
Zygote > Morula > Blastocyst
What does monozygotic mean?
Twins from one egg and one sperm
What does dizygotic mean?
Twins from two eggs and two sperms
Fraternal twins
Where does fertilisation occur?
Fallopian tubes
There are how many chromosomes in each gamete?
23 chromosomes
Not pairs
What is the embryonic period?
Lasts from 2-8 weeks after conception.
Embryonic disc transformed into 3 layers
- Ectoderm - Mesoderm - Endoderm
What is the function of the placenta?
- Respiration
- Nutrition
- Excretion
- Hormone production
What are the four placental hormones?
Progesterone
Oestrogen
Human chronic gonadatrophin
Human placental lactogen
What are the two membranes in the amniotic sac?
Amnion and chorion
What is amniotic fluid for?
Temperature control, allows symmetrical growth, allows movement and acts as a cushion
What is the function of the umbilical cord?
It is two arteries that carry blood away from the foetus and one vein that returns the blood to the foetus. This exchange takes place in layer of placenta separating foetus and mother.
It is about 55 cm long