X-inactivation
... Active chromatin – central position in nucleus, it allows maximal efficiency of replication and transcription 2. Centromeric heterochromatin - role in centromeric function – in cohesion of sister chromatids and normal disjunction of chromatids 3. Role in epigenetic regulation of gene expression duri ...
... Active chromatin – central position in nucleus, it allows maximal efficiency of replication and transcription 2. Centromeric heterochromatin - role in centromeric function – in cohesion of sister chromatids and normal disjunction of chromatids 3. Role in epigenetic regulation of gene expression duri ...
Cytogenetics: Karyotypes and Chromosome Aberrations
... Different stains and dyes produce banding patterns specific to each chromosome Karyotypes reveal variations in chromosomal structure and number • 1959: Discovery that Down syndrome is caused by an extra copy of chromosome 21 ...
... Different stains and dyes produce banding patterns specific to each chromosome Karyotypes reveal variations in chromosomal structure and number • 1959: Discovery that Down syndrome is caused by an extra copy of chromosome 21 ...
X n Y
... *If ‘B’ represents bald and ‘b’ is hairy then Men must be bb to keep hair Women can be Bb or BB to keep hair ...
... *If ‘B’ represents bald and ‘b’ is hairy then Men must be bb to keep hair Women can be Bb or BB to keep hair ...
14.1 Human Chromosomes
... Karyotypes A genome is the full set of all the genetic information that an organism carries in its DNA. Chromosomes are bundles of DNA and protein found in the nucleus of a eukaryotic cell. A karyotype is a picture that shows the complete diploid set of human chromosomes, grouped in pairs and arrang ...
... Karyotypes A genome is the full set of all the genetic information that an organism carries in its DNA. Chromosomes are bundles of DNA and protein found in the nucleus of a eukaryotic cell. A karyotype is a picture that shows the complete diploid set of human chromosomes, grouped in pairs and arrang ...
Chapter 3 human development
... VI. Differentiate between monozygotic twins and dyzygotic twins. a. Monozygotic twins are identical twins due to the zygote splitting into two identical organisms early in development. b. Dyzygotic twins are fraternal twins and it happens when two ova are fertilized by separate sperms at the same ti ...
... VI. Differentiate between monozygotic twins and dyzygotic twins. a. Monozygotic twins are identical twins due to the zygote splitting into two identical organisms early in development. b. Dyzygotic twins are fraternal twins and it happens when two ova are fertilized by separate sperms at the same ti ...
Chapter 15
... - parent types – offspring like parents - recombinant – offspring w/ new traits - a 50% frequency of recombination is observed for 2 genes on different chromosomes - If Morgan’s flies were completely linked it should be 1:1:0:0 but there were some recombinant types because of crossing over ...
... - parent types – offspring like parents - recombinant – offspring w/ new traits - a 50% frequency of recombination is observed for 2 genes on different chromosomes - If Morgan’s flies were completely linked it should be 1:1:0:0 but there were some recombinant types because of crossing over ...
Human genetics
... arranged from largest to smallest Largest autosome is #1: smallest autosome is ...
... arranged from largest to smallest Largest autosome is #1: smallest autosome is ...
Chapter 13 Chromosomes
... Down syndrome case. The two spontaneous abortions were the result of unbalanced gametes. Their problems are likely to repeat with a predictable and high frequency, because the translocated chromosome is in half of the carrier parents' gametes. In contrast, the Phelps' child with Down syndrome is mor ...
... Down syndrome case. The two spontaneous abortions were the result of unbalanced gametes. Their problems are likely to repeat with a predictable and high frequency, because the translocated chromosome is in half of the carrier parents' gametes. In contrast, the Phelps' child with Down syndrome is mor ...
Unit 4 Genetics - Jamestown Public Schools
... - ________ located close together on the same _________________ are _________, so they tend to be ______________ together - ___________ genes may be _______________, however, during _____________ ...
... - ________ located close together on the same _________________ are _________, so they tend to be ______________ together - ___________ genes may be _______________, however, during _____________ ...
Chapter 7 Notes Chapter 7 Notes
... Because the gene controlling the trait is located on the sex chromosome, It is linked to the gender of the individual. Usually found on the X chromosome. The result is that females will have two copies of the sex-linked gene while males will only have one copy of this gene. If the gene is recessive, ...
... Because the gene controlling the trait is located on the sex chromosome, It is linked to the gender of the individual. Usually found on the X chromosome. The result is that females will have two copies of the sex-linked gene while males will only have one copy of this gene. If the gene is recessive, ...
Genetics Lecture Part 2
... II. Sex linked genes exhibit unique patterns of inheritance Different chromosomal systems for sex discrimination A. Inheritance of sex linked genes (on X or Y) a. Color blindness b. Hemophilia: missing one or more blood clotting protein c. Duchene muscular dystrophy : weakening of the muscles and lo ...
... II. Sex linked genes exhibit unique patterns of inheritance Different chromosomal systems for sex discrimination A. Inheritance of sex linked genes (on X or Y) a. Color blindness b. Hemophilia: missing one or more blood clotting protein c. Duchene muscular dystrophy : weakening of the muscles and lo ...
Types of chromosome abnormalities
... • Short arrows indicate breakpoints in one homolog of each of two pairs of acrocentric chromosomes. The resulting fusion of the breaks yields one short and one long metacentric chromosome. • Under appropriate conditions, the short metacentric chromosome may be lost. Thus, we see a conversion from tw ...
... • Short arrows indicate breakpoints in one homolog of each of two pairs of acrocentric chromosomes. The resulting fusion of the breaks yields one short and one long metacentric chromosome. • Under appropriate conditions, the short metacentric chromosome may be lost. Thus, we see a conversion from tw ...
MATTERS OF SEX
... copy of chromosome 21. So you have Down syndrome The only chromosome we can inactivate is the X chromosome ...
... copy of chromosome 21. So you have Down syndrome The only chromosome we can inactivate is the X chromosome ...
Sex-determining Region of the Y chromosome
... A diploid embryo that is homozygous for a large deletion or male with a large deletion to its single X chromosome is usually missing يفتقدmany essential genes and this leads to a lethal ُم ِميتoutcome. ...
... A diploid embryo that is homozygous for a large deletion or male with a large deletion to its single X chromosome is usually missing يفتقدmany essential genes and this leads to a lethal ُم ِميتoutcome. ...
Mutations
... Somatic-Cell Mutations ◦ Take place in an organism’s body cells Can affect organism (certain types of cancer) Cannot be inherited ...
... Somatic-Cell Mutations ◦ Take place in an organism’s body cells Can affect organism (certain types of cancer) Cannot be inherited ...
Test 5 Notecards
... homologous chromosomes: a pair of chromosomes; one from the mother, one from the father. dominant: represented by at least one uppercase letter; if a dominant allele is present, the organism will show the dominant trait; can be BB or Bb. recessive: represented by two lowercase letters; if recessive ...
... homologous chromosomes: a pair of chromosomes; one from the mother, one from the father. dominant: represented by at least one uppercase letter; if a dominant allele is present, the organism will show the dominant trait; can be BB or Bb. recessive: represented by two lowercase letters; if recessive ...
Name
... 2. The offspring of two parents obtains a single copy of every gene from each parent. 3. A gamete must contain one complete set of genes. 4. Genes are located at specific positions on spindles. 5. A pair of corresponding chromosomes is homozygous. 6. One member of each homologous chromosome pair com ...
... 2. The offspring of two parents obtains a single copy of every gene from each parent. 3. A gamete must contain one complete set of genes. 4. Genes are located at specific positions on spindles. 5. A pair of corresponding chromosomes is homozygous. 6. One member of each homologous chromosome pair com ...
Biology 3201 Chromosomal Mutations Information Table
... in meiosis. This can also occur via tranlocation of genetic material from chromosome 14 to chromosome 21. This problem can develop in males or females. ...
... in meiosis. This can also occur via tranlocation of genetic material from chromosome 14 to chromosome 21. This problem can develop in males or females. ...
Chapter 15
... from the fertilization of gametes in which nondisjunction occurred = abnormal number of a particular chromosome A monosomic zygote has only one copy of a particular chromosome A trisomic zygote has three copies of a particular chromosome ...
... from the fertilization of gametes in which nondisjunction occurred = abnormal number of a particular chromosome A monosomic zygote has only one copy of a particular chromosome A trisomic zygote has three copies of a particular chromosome ...
Answers to 14.1 Genetics questions
... X chromosome is highly coiled into a Barr body…all the genes are switched off, leaving only 1 X chromosome active 16. Gene for coat color spots is on the X. Those cells whose active X has allele for black fur will have black spots. Other cells whose active X has orange coat color, will have orange s ...
... X chromosome is highly coiled into a Barr body…all the genes are switched off, leaving only 1 X chromosome active 16. Gene for coat color spots is on the X. Those cells whose active X has allele for black fur will have black spots. Other cells whose active X has orange coat color, will have orange s ...
Cell division: mitosis and meiosis I. Cell division -
... - a cell spends most of its life in interphase • G1 phase ...
... - a cell spends most of its life in interphase • G1 phase ...
Chapter 24: Patterns of Chromosome Inheritance
... Changes in Chromosome Number Nondisjunction occurs when: 1.) both members of a homologous pair go into the same daughter cell or 2.) when sister chromatids fail to separate and both daughter chromosomes go into the same gamete. The result is a trisomy or a monosomy. ...
... Changes in Chromosome Number Nondisjunction occurs when: 1.) both members of a homologous pair go into the same daughter cell or 2.) when sister chromatids fail to separate and both daughter chromosomes go into the same gamete. The result is a trisomy or a monosomy. ...
Genetics and Genetic Diseases
... Sex linked – non-sexual trait carried on X or Y chromosome, sometimes called xlinked since X chromosome is largest ...
... Sex linked – non-sexual trait carried on X or Y chromosome, sometimes called xlinked since X chromosome is largest ...
Add Meiosis Vocabulary to notes
... that contain double the amount of chromosomes than haploid cells Usually called the “normal” number of chromosomes Two copies of each gene ...
... that contain double the amount of chromosomes than haploid cells Usually called the “normal” number of chromosomes Two copies of each gene ...