{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

week1 - Chromosome 1 2 3 4 can be a single DNA molecule a...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chromosome: 1) can be a single DNA molecule- a single-chromatid chromosome (with the associated proteins) 2) a single-chromatid chromosome is represented by a single chain of beads 3) divided up into regions called genes -each gene determines a hereditary character. a. Allele - specific DNA nucleotide sequence present at a gene’s location or locus on the chromosome b. Different alleles can lead to different forms or traits of the character to produce different phenotypes 4) DNA replication occurs during the S sub phase of cell cycle prior to mitosis and meiosis a. Double-chromatid chromosomes - consisting of two identical DNA molecules b. Joined together by a centromere - a non-cooding region of DNA that binds sister chromatids together. c. Represented by two chains of beads, joined by a “centromere” bead pair. Ploidy: 1) Most eukaryotic species have their genes distributed on more than one type of chromosome. a. Humans (23), Sordoria fimicola (7), onion (6), lily (4) b. Ploidy state is the number of different chromosome types per cell c. Ploidy conditions- two common ones are i. Haploid (1n)- one copy of each chromosome type per cell, example-sperm cell, egg cell etc ii. Diploid (2n) - two copies of each chromosome type per cell.
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern