12-13-2010C-10 - Chapters 12 and 13 Objectives Describe...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapters 12 and 13 Objectives Describe binary fission in bacteria Describe the structures that play roles in the mitotic phase of the cell cycle: the centrioles, spindle microtubules and chromosomes Outline the phases of the cell cycle Describe the factors that control cell growth and how cancer results from a breakdown of this control Outline the general progression and overall results of meiosis, contrasting them with mitosis Explain how meiosis provides possibilities for genetic recombination Introduction Ch12/13 Life cycle is sequence of life forms from one generation to next Sexual reproduction involves passing traits from two parents to next generation Asexual reproduction involves passing traits from one parent to next generation Cell division is basis of all processes that link phases of life cycle Cellular Basis of Reproduction and Inheritance Chapter 12 and 13 Like beget like (more or less) True only for organisms that reproduce asexually single-celled organisms reproduce asexually by dividing in two called binary fission daughter cells receive identical copy of parents genes offspring of multi-cellular organisms not genetically identical to parents unique combination of parents traits breeders of domestic plants and animals manipulate sexual reproduction by selecting offspring that exhibit desired traits Cells arise from preexisting cells cell reproduction called cell division two roles enables fertilized egg to develop through various stages to adult organism ensures continuity from generation to generation Binary Fission Bacterial chromosomes genes carried on single circular DNA molecule up to 500x cell length minimal packaging complexed with few proteins and attached to plasma membrane at one point Binary fission prior to cell division, genome copied copies attached to adjacent parts of membrane cell elongation and new plasma membrane separates two genomes plasma membrane pinches through cell Eukaryotic Cell Division Eukaryotes have large, complex, multiple chromosomes human cells contain about 30,000-35,000 genes organized into separate, linear chromosomes DNA complexed with proteins Just prior to division, chromosomes become visible remain visible during division process Somatic Cells Somatic cells are body cells (not sex cells) Ex. Hair cells These cells need to contain the full set of chromosomes so that all the directions for functions and activities of the cell can be carried out. Normally you inherit 23 chromosomes from each of your parents This complete set of chromosomes (46) is known as the Diploid Number in Humans Sex Cells (Gametes) Sex cells are known as gametes These cells have half of the number of chromosomes that a body cell would have....
View Full Document

Page1 / 88

12-13-2010C-10 - Chapters 12 and 13 Objectives Describe...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online