• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Full Lecture 3
Full Lecture 3

... Outcome when one parent is affected and one is a carrier? 50% affected Why is PKU more common in consanguineous marriages? If PKU is in the family, blood relations are more likely to carry the allele for PKU ...
Exam1,2010 - Evolutionary Biology Homepage
Exam1,2010 - Evolutionary Biology Homepage

... (purple-flowered pea plants to white-flowered pea plants). His results are consistent with which of the following sets of parents? (A) homozygous dominant purple pea plant and homozygous recessive white pea plant (B) homozygous dominant purple pea plant and heterozygous white pea plant (C) heterozyg ...
Cat Eye Syndrome
Cat Eye Syndrome

... critical chromosomal region in CES8. CECR-1 is alternatively spliced and expressed in numerous tissues, primarily expressed in human adult heart, lung, lymphoblasts and placenta as well as foetal lung, liver, and kidney. FISH examination of a human embryo shows specific expression of CECR-1 in the o ...
Introducing genes
Introducing genes

... • Moving from the molecular level to the whole body level…. • The human body consists 50 to 100 trillion cells! • All of these (except red blood cells) contain all your genetic information. • However, cells differ in appearance (there are only 260 types of cells that make up four basic tissue types) ...
Mendel Punnett
Mendel Punnett

... of a gene (allele) and a lowercase letter is the abbreviation for the recessive form of the gene (allele). • Example below: P=dominant purple and p= recessive white The phenotype for this flower is violet while ...
Genetics Test 1 Review
Genetics Test 1 Review

... Discuss the events in a cell during prophase II and metaphase II in meiosis. Make special mention of any important differences between meiosis and mitosis at these times. ...
Cytology of Genetics
Cytology of Genetics

...  Loss of a section of a chromosome. This loss could be from an end or from within the chromosome.  Deletions can be caused by unequal crossing-over, by radiation or by movement of transposible elements.  Can observe deletions in meiosis during prophase I if the individual is heterozygous for the ...
Mendelian Genetics
Mendelian Genetics

... is determined by the alleles present for each trait. The type of genes an individual has. • Phenotype: Physical appearance of a trait. It is the expression of the genotype. ...
12GeneEvol
12GeneEvol

... E. A short deletion in the center of an intron. For each of the answers not selected above, give an example of a situation where that mutation could affect gene expression. 2. As described in a MC question above, humans possess 5 different genes for the β-globin subunit for hemoglobin, and 7 α-globi ...
INHERITANCE: BASIC CONCEPTS IN RISK ASSESMENT
INHERITANCE: BASIC CONCEPTS IN RISK ASSESMENT

... Problem sets that you must to be able to solve: Molecular Basis of Medicine web site I. The Chromosomal basis of inheritance. A. The human genome contains about 3 billion base pairs of DNA, packaged into 23 chromosomes. Most somatic cells are diploid, containing 23 pairs of chromosomes. Normal indiv ...
BIOL 2416 Genetics
BIOL 2416 Genetics

... • Involves siRNA-dependent initiation of heterochromatic silencing by RITS complex (RNA-induced Initiation of Transcriptional gene Silencing) ...
HUMAN CHROMOSOMES
HUMAN CHROMOSOMES

... compensation, as in male karyotypes there is only one X chromosome present, and in female - two. Thus the genotypic possibilities of male and female karyotype are equalized. It is important that this inactivation occurs randomly, so that in early embryonic life (after 16 days) different cells may ha ...
IB Bio Year 1 - Inglemoor High School
IB Bio Year 1 - Inglemoor High School

... dominant to cut) are linked and both are on the X chromosome. Use the symbols + and v for the eye color alleles, and + and c for the wing shape alleles. A male fruit fly with vermillion eyes and cut wings is mated to a red-eyed, long-winged female that is heterozygous for both genes. The following p ...
Variations from Mendel`s original Crosses
Variations from Mendel`s original Crosses

... •Each _________ involved can also have ____________ alleles. •Examples in humans include ________, skin pigmentation, weight, cleft palate, neural tube defects, __________________, the Rhesus factor and, most ______________ characteristics. •As there are ____________ genes involved with polygenic in ...
Slide 1
Slide 1

... • Some traits are controlled by more than one gene • There are more than 2 phenotypes – eye color – blood type – skin color – height ...
Educational Items Section Malignant blood diseases Atlas of Genetics and Cytogenetics
Educational Items Section Malignant blood diseases Atlas of Genetics and Cytogenetics

... • t(9;22)(q34;q11) • chromosome 22 appears shorter and was called Philadelphia chromosome (noted Ph) • translocates (part of) an oncogene, ABL, sitting usually in 9q34, next to (part of) another oncogene, BCR (breakpoint cluster region), in 22q11 --> production of a hybrid gene 5' BCR-3'ABL • the no ...
Biology 207 Workshop 5 1.The plant Haplopappus has only three
Biology 207 Workshop 5 1.The plant Haplopappus has only three

... age, therefore not pass the allele to future generations. However individuals who are heterozygous for a recessive lethal allele are not affected, but can pass the allele onto future generations. 8. In fruit flies, the allele for dachs (short-legged, d) is recessive to its allele for normal leg leng ...
Genit 2
Genit 2

... we find butterflies of various colors. Also, humans have many differences in such features as color of hair and eye, height… etc. Most of these variations are normal, meaning they are not associated with diseases, but other variations (which might be induced/acquired during life) might be abnormal a ...
Wednesday 3-4 Quiz 3 Answer Key
Wednesday 3-4 Quiz 3 Answer Key

Lecture 2 4285 2015 - Scheid Signalling Lab @ York University
Lecture 2 4285 2015 - Scheid Signalling Lab @ York University

... • Oocytes sit like this for decades • Complete meiosis II once each month • While arrested at the diplotene stage, the tetrad chromosomes are held together by chiasmata (formed during recombination) • If a pair of chromosomes don’t undergo recombination, the lack of chiasmata can contribute to non-d ...
Genetic lab 7
Genetic lab 7

... father and thus will be affected with the disorder. There is a 50% chance that one carrier parent will transmit the mutated gene and the other will transmit the normal gene; in this case, the child will have one mutated gene and one normal gene and will be a carrier of the disorder. Finally, there i ...
Genetics - Tour of the Basics
Genetics - Tour of the Basics

... daffodils, spiders to sea lions, and everything in between. How do proteins work in the body? Our bodies are made up of about _______________ cells! Each of these cells is responsible for a specific job. Every cell contains thousands of different proteins, which work together as tiny machines to ___ ...
1. Which organelles does the process of Adenosine triphosphate
1. Which organelles does the process of Adenosine triphosphate

... D) Polihybrid crossing 64. On which basis of data crossing did Mendel discover the third law of heredity? A) Monohybrid B) Dihybrid C) Mono-di-hybrid D) Polihybrid 65. Which of the following phenotypes is observed when splitting two crossbred heterozygous individuals differing in one pair of signs? ...
Plasmids by Dr. Ty C.M. Hoffman
Plasmids by Dr. Ty C.M. Hoffman

... circular  chromosome  of  a  bacterium,  only  much  smaller.  The  bacterial  chromosome  contains  all  the   genes  that  code  for  proteins  that  are  necessary  for  survival  under  normal  circumstances.  Plasmids   represent  DNA ...
Anemia_Pasta_GenTeac..
Anemia_Pasta_GenTeac..

... Remember that in meiosis, one copy of chromosome 6 and one copy of chromosome 9 are placed into each gamete. The gametes then unite to form a fertilized egg with two copies of chromosome 6 and two copies or chromosome 9, one from each parent. You will now use the affected child’s parents simulated D ...
< 1 ... 391 392 393 394 395 396 397 398 399 ... 681 >

X-inactivation



X-inactivation (also called lyonization) is a process by which one of the two copies of the X chromosome present in female mammals is inactivated. The inactive X chromosome is silenced by its being packaged in such a way that it has a transcriptionally inactive structure called heterochromatin. As nearly all female mammals have two X chromosomes, X-inactivation prevents them from having twice as many X chromosome gene products as males, who only possess a single copy of the X chromosome (see dosage compensation). The choice of which X chromosome will be inactivated is random in placental mammals such as humans, but once an X chromosome is inactivated it will remain inactive throughout the lifetime of the cell and its descendants in the organism. Unlike the random X-inactivation in placental mammals, inactivation in marsupials applies exclusively to the paternally derived X chromosome.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report