{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapt+5+for+Sakai

Chapt+5+for+Sakai - Chapter 5 Nature Nurture Human...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 5 Nature, Nurture, Human Development
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Genes and Heredity Heredity : Defines your nature. Based on biological transmission of traits from one generation to next, from your parents to you, and from you to your kids. Genetics : Is the branch of biology that studies heredity. Genetics is your ht, hair texture, eye color, plays a role in your intelligence, etc Chromosomes - Rod shaped structures composed of genes that are found within the nucleus of the cells. Genes - Each chromos contains thousands of pieces called what? Humans have 46 chromosomes – 23 pairs – in every body cell except for the sex cells. Sperm and ova each contain 23 unpaired chromosomes that unite at conception .
Background image of page 2
Figure 5.1 Genes are sections of chromosomes in the nuclei of cells
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Genetic Principles Genes If an individual receives one gene for wavy hair and another for straight hair, that individual’s hair will be wavy . The gene for wavy hair is a dominant gene. It is referred to as dominant. A single copy of the gene is sufficient to produce its effect. The same with eye color. You must receive a gene for blue eyes from both parents in order to develop blue eyes. The gene for blue eye color is a recessive gene.
Background image of page 4
Segments within DNA consist of  genes  that make proteins to determine our  development. 
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
TWINS TWINS : Twins are a form of multiple birth in which the mother gives birth to two offspring from the same pregnancy , either of the same or opposite sex . How are the twins forms? A zygote (zi-goat) (the single cell) divides into 2 cells so that each develops into an individual with the same genetic makeup. We begin life as a single cell called zygote, that divides again & again. Monozygotic , (mono-zie-got-ic) or identical , twins develop from a single fertilized egg and have identical genes. Derived from a single zygote that has split in two = identical. Dyzygotic , (Die-zee-got-ic) or fraternal , twins develop from two eggs and share only half of their genes. The two eggs form two zygotes .
Background image of page 6
Genetic Principles Sex-linked genes The sex chromosomes determine whether an individual will become a male or female. There are two types of sex chromosomes, called X and Y. Females receive an X from each parent; males receive an X from mother and a Y from father.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Figure 5.12a Figure 5.12a Fetal alcohol syndrome If mother drinks alcohol during pregnancy , the baby is likely to be born with fetal alcohol syndrome (FAS). The more alcohol a woman drinks during pregnancy, the more likely her baby is to have anomalies of the head, face, and organs . FAS is characterized by stunted growth of the head and body, facial, cranial and ear malformations, neurological damage, learning disabilities, and mental retardation. Figure 5.12a
Background image of page 8
Behavioral Capacities of the Newborn Newborns have little muscle control, and exhibit the greatest purposeful movement with their eyes and mouths. Development proceeds from the head down and from the midline out, and so gradually babies can move their trunks, limbs and fingers.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}