Chapter 9 Flashcards
Genotype
The genetic make up of an individual organism.
Phenotype
The observable traits of characteristic of an organism as determined by the interactions of genetics and environmental factors.
Zygote
The single cell formed at conception from the union of an egg cell and a sperm sell.
How many chromosomes does each parent contribute at conception?
23 chromosomes each
Epigenetics
The study of the cellular mechanisms that control gene expression of the ways that gene expression impacts health and behavior.
Stages of Prenatal Development:
Germinal Period
AKA zygotic period; represents the first two weeks of prenatal development.
The zygote experiences rapid cell division before implanting itself in the mother’s uterine wall.
By the end of this period, the zygote has developed into a cluster of cells called the embryo
Stages of Prenatal Development:
Embryonic Period
The 3rd - 8th week period of prenatal development.
Rapid growth and intensive cell differentiation.
Organs and major systems of the body form.
Genes of the sex chromosomes and hormonal influences also trigger the initial development of sex organs.
By the end of the embryonic period, the embryo has grown into over an inch in length, weighing about an ounce.
Stages of Prenatal Development:
Fetal Period
The 3rd month marks the start of the fetal period, the third and longest period of prenatal development.
Body systems are growing and maturing
Newborn Reflexes:
Grasping
Stroking the palm of a baby’s hand causes the baby to close his or her fingers in a grasp. The grasp reflex lasts until the baby is about 5 to 6 months old. A similar reflex in the toes lasts until 9 to 12 months.
Newborn Reflexes:
Rooting
This reflex starts when the corner of the baby’s mouth is stroked or touched. The baby will turn his or her head and open his or her mouth to follow and root in the direction of the stroking. This helps the baby find the breast or bottle to start feeding. This reflex lasts about 4 months.
Newborn Reflexes:
Sucking
Rooting helps the baby get ready to suck. When the roof of the baby’s mouth is touched, the baby will start to suck. This reflex doesn’t start until about the 32nd week of pregnancy and is not fully developed until about 36 weeks.
Which sense is the least developed at birth?
Vision
Temperament definition
Inborn predispositions to consistently behave and react in a certain way.
Temperaments:
Easy
Adaptable, Positive mood, regular sleeping/eating patterns
Temperaments:
Difficult
Intense emotions, irritable, cry frequently, irregular patterns.
Temperaments:
Slow to warmup
Low activity, withdraw from new situations/people, adapt to new experiences gradually.
Securely attached infants
- explore the room when their mothers are present
- become upset and explore less when their mothers are not present
- show pleasure when their mothers return
Insecurely Attached Infants
- less likely to explore the environment, even when their mothers are present
- may appear anxious or indifferent to the mother, or extremely distressed
- hard to soothe and may resist mother’s attempts to comfort them