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Presentation transcript:

Joke of the Day:

Unit 11: Fertilization and Pregnancy

Fertilization Video http://www.youtube.com/watch?v=_5OvgQW6FG4

Fertilization Sperm: Male sex cell (Haploid) Ovum: Female sex cell (Haploid) Ovulation: Every 28 day…1 egg matures/released into Fallopian Tube, lives 12-24 hrs, Occurs approx 2 weeks before next period (most fertile time) Menstruation: Shedding of ovum and uterine lining if fertilization does not occur

Fertilization Fertilization: Fusion of Sperm and Egg making a Zygote, Usually occurs in Fallopian Tube Zygote: Fertilized egg (Diploid)

Fertilization Question: Who does a female zygote receive chromosomes? + Female - XX Egg Haploid n=23 Male - XY Sperm Haploid n=23 Female - XX Zygote Diploid 2n=46 Answer: Both Mother and Father

Pregnancy Definition: The state of a woman carrying a fertilized egg. Time from conception to birth is usually 9 months

Pregnancy

Divided into 3 trimesters:

1st Trimester (Weeks 1-12)

1st Trimester - Mother Major Hormonal Changes: (estrogen, progesterone) Menstruation stops Fatigue Upset Stomach / Nausea Tender Breasts

1st Trimester Baby at 4 weeks Brain spinal cord, heart appear Arm buds form (Baby is 1/25th of an inch)

1st Trimester Baby at 8 weeks Heart begins to beat Eyes move forward on head Fingers and toes appear

1st Trimester Baby at 12 weeks Nerves, muscles work together (fist) Eyes close until 28th week Sex organs appear

2nd Trimester (Weeks 13-28)

2nd Trimester - Mother Nausea goes away Weight gain Feel baby move towards the end of trimester

2nd Trimester Baby at 16 weeks Complex skeleton forms Transparent skin forms Reaches 4 to 5 inches. Weighs 3 ounces.

2nd Trimester Baby at 20 weeks Baby becomes more active Eyebrows, nails form Baby can hear and swallow.

2nd Trimester Baby at 24 weeks Bone marrow begins to make blood cells Lungs form but don’t work Baby wakes and sleeps regularly.

3rd Trimester (Weeks 29-40)

3rd Trimester - Mother Most weight gain Frequent urination Swelling in feet, ankles

3rd Trimester Baby at 32 weeks Bones are finished but soft Eyes can open and close “Practice” breathing movements occur

3rd Trimester Baby at 36 weeks Baby’s body fat increases Less space to move 16-19” long. 6-7 pounds

3rd Trimester Baby at 37-40 weeks Organs are fully functional baby turns “head down” Birth occurs!

Stages of Pregnancy Video http://www.youtube.com/watch?v=dgF8fYrTOC4