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Factors of Human Development part1
Transcript of Factors of Human Development part1
Development is consist of systematic changes and continuities in the individual that occurs between conception to death or from womb to tomb.
Heredity and Maturation
from conception to birth
Human Development as a Science
Human development is the study of the human cycle from conception to death.
Genes are carriers of heredity information passed on from parents to offspring.
Chromosomes are gene carriers. At conception, an organism has 23 pairs of them.
This is how a chromosome looks like.
Each parent will give their offspring 23 chromosomes each.
23rd chromosome is the sex chromosome (gonosome)
Determination of Twins
conceived when two eggs were released and were fertilized by two sperms.
came from a single zygote that split during its early stage of development
Caused by an abnormality in the gene composition
genetic defect where a female possesses only one x chromosome
results in stunted sexual development, visual agnosia, absence or retardation of secondary sex characteristics, webbing of the skin of the neck and infertility.
Male Chromosomal Conditions
excess of one unpaired chromosome appearing in the 23rd chromosome
a chromosomal condition that affects male physical and cognitive development. Its signs and symptoms vary among affected individuals.
Associated with physical, sexual retardation and intellectual disability.
Affected individuals are usually very tall. Many experience severe acne during adolescence. Additional symptoms may include learning disabilities and behavioral problems such as impulsivity. Intelligence is usually in the normal range, although IQ is on average 10-15 points lower than siblings.
caused by the presence of three 21st chromosome
associated with a delay in cognitive ability and physical growth, and a particular set of facial characteristics
an inherited disorder in which the enzyme that converts the amino acid phenylalanine is defective.
results to damage in the central nervous system and mental retardation
Conception to week 2
Called the period of the ovum. After week 1, the zygote is made up of 100 to 150 cells.
By the end of the second week, the mass of cell has attached to the uterine wall.
week 3 through 8
neural tube emerges,
arm and leg buds emerge during the 4th week
heartbeat starts, face and intestines appears at 5th week
2nd to 9th month
mature organs and muscles
mother feels fetus' movements
eyes and eyelids are formed
fine layer of hair, grasping reflex
7-9 months, fetus is longer and organs function well.
End of Part 1. Thank you for listening.