Bio93_Review - Bio 93 Summer 2006 Final Exam Review Monday...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Bio 93 Summer 2006 Final Exam Review Monday 7/31/06 Bio 93 Summer 2006 review-1 Summer 2006, Bio93, Felix Grün, Copyright reserved 1 st hour: review of lecture material 2 nd hour: Q+A. If you do not understand a topic please prepare a question
Image of page 1

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

View Full Document Right Arrow Icon
Somatic cells of each species contain a specific number of chromosomes Human cells have 46, making up 23 pairs of homologous chromosomes Duplicated chromosome Centromere Sister chromatids Summer 2006, Bio93, Felix Grün, Copyright reserved review-2 Can you accurately describe chromosome structure at different stages of the cell cycle & behaviour during mitosis 1 DNA polymer (double helix) 1 chromosome = Homologous pair maternal paternal
Image of page 2
MITOSIS MEIOSIS PARENT CELL (before chromosome replication) Site of crossing over MEIOSIS I PROPHASE I Tetrad formed by synapsis of homologous chromosomes PROPHASE Duplicated chromosome (two sister chromatids) METAPHASE Chromosome replication Chromosome replication 2 n = 4 ANAPHASE TELOPHASE Chromosomes align at the metaphase plate Tetrads align at the metaphase plate METAPHASE I ANAPHASE I TELOPHASE I Sister chromatids separate during anaphase Homologous chromosomes separate during anaphase I ; sister chromatids remain together No further chromosomal replication; sister chromatids separate during anaphase II 2 n 2 n Daughter cells of mitosis Daughter cells of meiosis II MEIOSIS II Daughter cells of meiosis I Haploid n = 2 n n n n Summer 2006, Bio93, Felix Grün, Copyright reserved review-3
Image of page 3

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

View Full Document Right Arrow Icon
The stages of meiotic cell division: Meiosis I Summer 2006, Bio93, Felix Grün, Copyright reserved review-4
Image of page 4
The stages of meiotic cell division: Meiosis II Summer 2006, Bio93, Felix Grün, Copyright reserved review-5
Image of page 5

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

View Full Document Right Arrow Icon
GENE LOCI P a B DOMINANT allele RECESSIVE allele P a b GENOTYPE: PP aa Bb HOMOZYGOUS for the dominant allele HOMOZYGOUS for the recessive allele HETEROZYGOUS Alternative forms of a gene (alleles) reside at the same locus on homologous chromosomes How are genes and alleles arranged on chromosomes ? Summer 2006, Bio93, Dr. F. Grün, Copyright reserved review-6
Image of page 6
YYRR P Generation Gametes YR yr × yyrr YyRr Hypothesis of dependent assortment Hypothesis of independent assortment F 2 Generation (predicted offspring) 1 2 YR YR yr 1 2 1 2 1 2 yr YYRR YyRr yyrr YyRr 3 4 1 4 Sperm Eggs Phenotypic ratio 3:1 YR 1 4 Yr 1 4 yR 1 4 yr 1 4 9 16 3 16 3 16 1 16 YYRR YYRr YyRR YyRr Yyrr YyRr YYrr YYrr YyRR YyRr yyRR yyRr yyrr yyRr Yyrr YyRr Phenotypic ratio 9:3:3:1 315 108 101 32 Phenotypic ratio approximately 9:3:3:1 F 1 Generation Eggs YR Yr yR yr 1 4 1 4 1 4 1 4 Sperm Independent Assortment Summer 2006, Bio93, Dr. F. Grün, Copyright reserved review-7 What implications does this have for genetic inheritance patterns ?
Image of page 7

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

View Full Document Right Arrow Icon
A cross between two black mice that are heterozygous (BbCc) will follow the law of independent assortment.
Image of page 8
Image of page 9
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