• Study Resource
  • Explore Categories
    • 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
Cell Reproduction & Mitosis
Cell Reproduction & Mitosis

... humans are called autosomes not directly involved in determining the gender of an individual ...
genetics ppt
genetics ppt

... Barr Body The inactivation of an X chromosome occurs randomly in each embryonic cell, therefore females consist of a mosaic of 2 types of cells (active x from mom or active x from dad) Ex. Tortoise shell cats ...
GENETICS The Science of Heredity
GENETICS The Science of Heredity

... E. Codominance 1. some alleles are not dominant or recessive 2. both alleles are expressed in offspring 3. codominant alleles are are written with a superscript, for example…go to pg. 93 ...
Sex Linkage and Recombination
Sex Linkage and Recombination

... Explain why X-linked traits may occur more frequently in one sex over the other In humans, males and females are represented by different sex chromosomes Females have two X chromosomes in the nucleus of their cells. Males have one X chromosome and one Y chromosome in the nucleus of their cells. Depe ...
Study Questions for Chapter 12 –
Study Questions for Chapter 12 –

... chromosomes (lyonization) produces individuals with different proportions of cells with a functioning allele. Normal clotting times would be expected in females with a functional h+ allele, i.e., females whose hbearing X chromosome was very frequently inactivated. Clinical hemophilia would be expect ...
Sex Linkage and Recombination
Sex Linkage and Recombination

... Explain why X-linked traits may occur more frequently in one sex over the other In humans, males and females are represented by different sex chromosomes Females have two X chromosomes in the nucleus of their cells. Males have one X chromosome and one Y chromosome in the nucleus of their cells. Depe ...
CHAPTER 10 notes
CHAPTER 10 notes

... • Alleles: alternative form of single gene • For example: height ...
Supplemental material
Supplemental material

... and spermatocytes from males hemizygous for a chromosome 2 transgene carrying a 256-mer tandem array of lacO repeats and heterozygous for a transgene (also on chromosome 2) expressing a GFP-LacI chimeric protein under control of the hsp83 promoter. The genotype of the tested males was w1118/Y; Df(2L ...
Biol 211 (1) Exam 4
Biol 211 (1) Exam 4

... support Mendel’s laws between 1877 and 1916. ___________ was skeptical about Mendelian genetics and did experiments using Drosophila melanogaster (fruit fly). 2. What does the Chromosome Theory of Heredity propose? a. ...
Zoo/Bot 3333
Zoo/Bot 3333

... a) reciprocal translocations have occurred, giving rise to balanced translocation heterozygotes; b) inversions have occurred suppressing crossing over; c) deletions have occurred in two different regions of the chromosome; d) duplications have occurred in two different regions of the chromosome; e) ...
Bio 309F
Bio 309F

... A. gene B. cytosol C. nucleus D. mitochondria E. nuclear membrane 14. An allele is _________ A. one of the bases of DNA B. an alternate form of a gene C. another term for epistasis D. present only in males and is responsible for sex determination E. found in mitochondria but not in the nucleus 15. I ...
Origin of Mutations in Two Families With X-Linked
Origin of Mutations in Two Families With X-Linked

... mother has discoid lupus and is otherwise healthy. A maternal aunt and the maternal grandfather are alive and well. The maternal grandmother, now deceased, was part of a large sibship; none of her five brothers had unusual infectionsor died in infancy. Family 2 has one affected boy, born in 1984 and ...
Chromosome Rearrangements - Western States Genetics Services
Chromosome Rearrangements - Western States Genetics Services

... is a chance that they will. Your physician or genetic counselor may suggest additional studies of your fetus to identify any possible problems. They may suggest a detailed ultrasound and an echocardiogram (a detailed ultrasound examination of the baby’s heart). Since it is not possible to identify a ...
Inheritance [Repaired]
Inheritance [Repaired]

... as small letter and call it recessive. If we assume that these genes represent eye colour and B= brown and b = blue when B is present we can get two genotypes BB or Bb and their phenotypes will all be brown but we can also get an allele combination of bb which will give a blue phenotype If BB is hom ...
Antigens
Antigens

... – Bent and twisted (sickle-shaped) red blood cells tend to get stuck in capillaries. This damages tissues (brain, heart, spleen) and may be fatal. – Homozygotes and heterozygotes are affected to differing degrees. ...
BIOLOGICAL EXPLANATION OF AGGRESSION
BIOLOGICAL EXPLANATION OF AGGRESSION

... generation to another.  Animal studies such as Cairns and Nelson have shown this.  But there are environmental influences as well such as upbringing and social influences (SLT, deindividuation, cue arousal, relative deprivation etc.)  These are played down by the genetic explanation. ...
Chapter Three
Chapter Three

... the parents and so form a cycle, similarly, e,f,c,b,i,a form another cycle. There can be more than two cycles)  Result dxxxxxghx + xfbecixxa = dfbcigha Two point PMX and 2-point simple crossovers And others… ...
7. Oswaldo Hasb n - Cri-du-Chat
7. Oswaldo Hasb n - Cri-du-Chat

... a small region within central 5p15.2. • Deletions that did not include these 2 chromosomal regions presented varying clinical phenotypes from severe mental retardation and microcephaly to a clinically normal phenotype. • The CTNND2 gene maps to a specific region in chromosome 5p15.2 implicated in th ...
Section 14-1
Section 14-1

... produce offspring with an abnormal number of sex chromosomes. ...
Genetic Disorder Template
Genetic Disorder Template

... blue eyes you need a blue eye gene from both parents to have blue eyes so if both parents have blue eyes you will just like if both parents have Cystic Fibrosis their child will. ...
MEIOSIS Notes
MEIOSIS Notes

... Make a Baby | How Cells Divide: Mitosis vs. Meiosis (Flash) ...
Mendel and Gen terms BIO
Mendel and Gen terms BIO

... with only two alleles. Ex. Flower color: purple or white 4) No blending of traits 5) Can control breeding because of access to male and female sex parts ...
MF011_fhs_lnt_002b_May11 - MF011 General Biology 2 (May
MF011_fhs_lnt_002b_May11 - MF011 General Biology 2 (May

... (d) The haplo-diploid system ...
Challenge Questions
Challenge Questions

... Questions and Discussion  Pre‐seminar School Discussion  This seminar focuses on the role of mutations in the inheritance of genetic conditions, and the biotechnologies that  can  be  used  to  screen  and  diagnose  for  these  conditions  before  and  during  pregnancy.    While  the  focus  is  o ...
13.3_201-204
13.3_201-204

... means. Errors can be made during replication. Environmental conditions may increase the rate of mutation. Mutagens are chemical or physical agents in the environment that cause mutations. The effects of mutations on genes vary widely: Some mutations have little or no effect. Some mutations produce b ...
< 1 ... 98 99 100 101 102 103 104 105 106 ... 241 >

Skewed X-inactivation

Skewed X chromosome inactivation occurs when the inactivation of one X chromosome is favored over the other, leading to an uneven number of cells with each chromosome inactivated. It is usually defined as one allele being found on the active X chromosome in over 75% of cells, and extreme skewing is when over 90% of cells have inactivated the same X chromosome. It can be caused by primary nonrandom inactivation, either by chance due to a small cell pool or directed by genes, or caused by secondary nonrandom inactivation, which occurs by selection. Most females will have some levels of skewing. It is relatively common in adult females; around 35% of women have skewed ratio over 70:30, and 7% of women have an extreme skewed ratio of over 90:10. This is of medical significance due to the potential for the expression of disease genes present on the X chromosome that are normally not expressed due to random X inactivation. X chromosome inactivation occurs in females to provide dosage compensation between the sexes. If females kept both X chromosomes active they would have twice the number of active X genes than males, who only have one copy of the X chromosome. At approximately the time of implantation (see Implantation (human embryo), one of the two X chromosomes is randomly selected for inactivation. The cell undergoes transcriptional and epigenetic changes to ensure this inactivation is permanent. All progeny from these initial cells will maintain the inactivation of the same chromosome, resulting in a mosaic pattern of cells in females.
  • studyres.com © 2026
  • DMCA
  • Privacy
  • Terms
  • Report