VS

Names: Lee Zheng De Siti Nurzhahirin Siti Nurhanisah Noor Faizah

What is menstruation?
 * Question 1:**

The monthly discharge of blood or menses from the uterus via the vagina.

State the hormones involved in menstruation and where they are produced. You can present your answer in any appropriate manner you seem fit.
 * Question 2:**

1) Oestrogen; produced by the ovaries/corpus leuteum 2) Progesterone; produced by the corpus leuteum 3) Luteinising Hormone; produced by the pituituary gland 4) Follicle-Stimulating Hormone; produced by the pituituary gland

Explain the stages on the menstrual cycle. Include the timeline and hormones involves where necessary. Explain each stage in detail. You can present your answer in any appropriate manner you.
 * Question 3:**

Day 1-5 Day 6-11 Day 11-17 Day 17-28
 * Menstrual flow
 * Pituituary gland releases FSH
 * One follicle matures to become Grafiaan follicle
 * FSH stimulates ovary to rrelease oestrogen
 * Oestrogen stimulates growth and repair of uterine lining
 * When oestrogen is in high concentration, FSH release is inhibited.
 * Stimulates pituituary gland to release LH
 * LH causes ovulation on day 14th
 * LH stimulates formation of corpus leuteum
 * Corpus leuteum releases progesterone and oestrogen
 * Progesterone maintains thickness of uterine lining and inhibits ovulation and FSH production to prevent multiple pregnancies from occuring
 * Corpus leuteum breaks down if there is no fertilisation

Vithya! Subashini! 1. What is DNA? Deoxyribonucleic acid, DNA is a molecule that carries genetic infomation. 2. How is DNA organized inside the cells? DNA runs in the opposite direction (anti-parallel). Bonded by hydrogen through the opposite chain. The two strands twist and coil to form a double helix. A molecule of DNA is wrapped around proteins to form chromatin thread. Chromatin threads are coiled tightly into chromosomes.

3. What is gene? A sequence of nucleotide which controls the formation of a single protein.

4. What is the basic unit of DNA and what is it made up of? Basic unit: nucleotide. Nucleotide: deoxyribose (sugar), phosphate group and a base (nitrogen)

5. State the rules of base pairing. Base Cytosine will always pair with Guanine. Base Adenine will always pair with Thymine.Adenine and Thymine are complementary bases.

Define genes Genes are a unit of inheritance. Small segement of DNA in chromosome where information is stored.

2. Define alleles Different forms of the same gene are called alleles.

3. Define chromosomes Made up of deoxyribonucleic acid which carry the information for making new animal bodies. 4. Define homologous chromosomes Exist in pairs, have exactly the same sequence of gene loci and are simlair in shape and sizes. 5. Define heterozygous chromosome A pair of alleles which is different for a trait. 6. Define phenotype Expressed trait of an organism 7. Define genotype Genetic makeup (pair of alleles for each trait)        Save Preview Text Editor