Lecture 22 and 23 meiosis

Lecture 22 and 23 meiosis - Lecture 23:Meiosis and Sexual...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 23:Meiosis and Sexual life cycles Campbell - Chapter 13 pp 238-250 Learning objectives The objective of this lecture is to understand the basis for both similarities and differences among siblings at the molecular level. Compare and contrast diploid and haploid cells. Recognize the phases of meiosis from diagrams or micrographs ( Know the details of Figure 13.8 ). Describe the changes in number, and movements of chromosomes during meiosis. Define the relationship between homologous chromosomes and sister chromatids. Compare the timing, location, numbers of cells, chromosome numbers, and genetic outcomes of mitosis and meiosis. Describe the molecular details of synapsis and crossing over Understand what is meant by independent assortment of chromosomes Distinguish human male and female karyotypes. Be able to draw a diagram that illustrates the relationships among the terms: chromosome, DNA, genes, chromatids, centromeres, homologous chromosomes (homologues), and alleles. Assigned problems: 1-10 on page 250
Background image of page 1

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

View Full DocumentRight Arrow Icon
Terms you should know Diploid haploid gamete somatic cell sexual reproduction asexual reproduction maternal chromosome paternal chromosome homologous chromosome tetrad karyotype zygote fertilization independent assortment sister chromatid meiosis I meiosis II heredity gene locus synapsis chiasmata crossing over
Background image of page 2
HEREDITY AND GENETICS The transmission of traits from one generation to the next is called heredity. Along with inherited similarity, there is also variation. Genetics = The scientific study of heredity and hereditary variation.
Background image of page 3

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

View Full DocumentRight Arrow Icon
There are two methods of reproduction: ASEXUAL: Mitosis gives rise to two identical daughter cells SEXUAL: Two parents contribute DNA to one offspring. That is, a sperm and egg fuse during fertilization to give rise to a single cell that will develop into the offspring
Background image of page 4
If the number of chromosomes is constant from cell to cell, how can sperm and egg combine to form an offspring with the same number of chromosomes as its mother and father, rather than twice the number? THE ANSWER: The number of chromosomes in sperm and egg cells (gametes) have 1/2 as many chromosomes as all the other cells (somatic cells) in the body. Chromosome number in gametes is reduced to half by the process
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 32

Lecture 22 and 23 meiosis - Lecture 23:Meiosis and Sexual...

This preview shows document pages 1 - 6. Sign up to view the full document.

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