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Asexual and Sexual Reproduction

Asexual Reproduction,Sexual Reproduction,Heredity, Punnett Square, and the works of Gregor Mendel How Exciting c:

Margaux Taylor

on 7 May 2011

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Transcript of Asexual and Sexual Reproduction

A presentation by Brandon Plaza... And Margaux May..... DNA stands for
Deoxyribonucleicacid DNA is the blueprint of an organisms genetic makeup It replicates itself by splitting, unzipping itself like a zipper Once detatched,the split side of the ladder connects with free floating nucleotides Nucleotides are single units that make up DNA;building blocks of life Genes are smaller units of DNA;
it controls hereditary characteristics Genes carry biological info in a form that must be copied from each cell. Chromosomes are made of DNA and protiens. They are within the nucleus of a cell. They determine things such as hair color and eye color to gender. Genetics deal with molecular structure of genes,with genes behavior in the context of an organism.It is inherited from parent. Traits They're are a few types of traits. They can be inheritted or learned. The enviorment can influence them heavily.Traits like height,weight,and musical ability are influenced by the enviorment. Some traits that come from parents include eye color, blood type, and hair color. Fission is subdivision of an organism; regeneration of the parts into a complete individual. Vegetative propogation is a form of asexual reproduction in plants.New individuals rise without seeds or spores.Runners,rhizomes and tubers have different ways of doing this. Budding is when one organism grows on another.
It stays attatched until it is mature. Sperm is the male sex cell. It has 23 chromosomes. Sperm have a long "tail like" appendage to propel them. They are produced in the testes. Egg is the female sex cell. It also has 23 chromosomes like sperm. They are produced in the ovaries. The egg does not leave the female body in order to unite with sperm. The process of meiosis Stage 1:
At the beginning of meiosis, there are 23 pairs of chromosomes, or 46 chromosomes in each immature sex cell in humans. Stage 2: The cell duplicates the chromosomes, resulting in 92 chromosomes. Stage 3: The cell divides into two cells,each having 46 chromosomes. Stage 4: Both new cells begin a second division. These chromosomes are not duplicated.
How to use the Punnet Square The Punnet Square is a diagram to predict an outcome of cross breeding. Step 1: Choose traits to use
Step 2: draw a box and a lines so you have four small boxes

Step 3: Write the traits of both parents on the side of it Step 4: Fill the squares by writing an an unspecific letter above or beside each box Step 5: List the combination of genes you got as a result to figure out the probability of the offspring innheriting the trait Our sources; on a more vague note, is Discovery Works science book, the internet and cellular devices. Recessive Inheritance

Both parents carry a normal gene, and a faulty, recessive, gene. The parents, although carriers, are unaffected by the faulty gene. Their offspring are affected, not affected, or carriers. This type of inheritance was first shown by Mendel. Dominant Inheritance

One parent has a single, faulty dominant gene, which overpowers its normal counterpart, affecting that parent. When the affected parent mates with an unaffected and non-carrier mate, the offspring are either affected or not affected, but they are not carriers. Gregor Mendel was an Austrian monk and scientist who gained fame around the 20th century as the leader of the new science of genetics for his study of the inheritance of certain traits in pea plants. Mendel showed that the inheritance of these traits follows particular laws, which were later named after him. Mendel discovered individuals carry two
genes for each trait, but pass down only one. Mendel also found out one trait is dominant over the other. After cross pollinating to non-purebred pea plants, the offspring were all tall like the female, and when he crossed the other two, he received three tall pea plants and one short pea plant.

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