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Introduction to genetics - Wikipedia


A long molecule that looks like a twisted ladder. It is made of four types of simple units and the ... Genes are made up of molecules inside the nucleus of a cell that are strung ... sperm in males ...

Basic Genetics > Genetics > HoG Handbook > Hemophilia of Georgia


These are the eggs in a woman and the sperm in a man. They only have 23 ... The chromosomes are kept in a special part of the cell called a nucleus. If you had a very ... An egg or sperm only has half of the parent's sex chromosome pair. An egg will ... What type the person has depends on which gene has the defect.

Chromosomes: Your Genetic Blueprint : Ingender.com


If you're a human, 46 is the magic number: we have 46 chromosomes, in 23 matched pairs. ... genetic blueprint, or your genome, in the 46 chromosomes in its nucleus. ... pairs of chromosomes, an egg or sperm has only 23 single chromosomes. ... eye color, and of the color of your eyes depends on which gene is dominant.

Chromosomal Sex Determination in Drosophila - Developmental ...


If there are two X chromosomes in a diploid cell (2X:2A), the fly is female ... This can happen when an X chromosome is lost from one embryonic nucleus. ... Such mutations have no effect on sex determination in XY males. ... a particular embryonic type of Sxl mRNA that is found for only about 2 hours more (Salz et al. 1989).

Cell division and chromosomes - BioTopics Website


Before a cell divides, its nucleus must divide, in order to pass on this ... contains male gametes, and the embryo sac within the ovary contains a female gamete. ... restoring the normal double number of chromosomes in the (single) cell, the zygote. ... only slowly, and does not spread then it is said to be benign; if it shows no ...

Genes and Chromosomes - Fundamentals - Merck Manuals ...


Whether and how a gene is expressed is determined not only by the genotype .... Gene expression depends on the type of tissue, the age of the person, the ... Most polymorphisms have no effect on the phenotype (see Genes and Chromosomes). ... cells), the nucleus of every human cell contains 23 pairs of chromosomes, ...

Human Physiology/Genetics and inheritance - Wikibooks, open ...


For all forms of life, continuity of the species depends upon the genetic code being ... of DNA which are contained on a chromosome within the nucleus of a cell. ... They have both male and female parts and can easily be grown in large numbers. .... Autosomal dominant, Only one mutated copy of the gene is needed for a ...

Sex Chromosomes and Sex-Linked Inheritance - Biology Questions


Study sex chromosomes, sex-linked inheritance, x-linked traits, y-linked diseases , ... The individual of the female sex is XX and therefore only forms gametes ... To analyze the X DNA of a mother (assuming no access to her own genetic .... of a phenotype of a gene in heterozygosity depends on the sex of the individual.

All about genetics | Contact a Family


This number of chromosomes is known as the 'diploid' number. ... Inheritance will depend upon the arrangement of the genes on our chromosomes and the ... Autosomal inheritance means that males or females are equally affected, this is .... is passed on through the egg but not by the sperm as it is only the nucleus of the .....

The dosage compensation complex shapes the conformation of the ...


In mammals, one of the two X chromosomes in female nuclei is repressed by .... this was only the case in 4% of the female nuclei (Supplemental Table S1). ... The average number of nuclei analyzed per condition was 220. .... The male-specific X-chromosome conformation depends on MSL1–MSL2 but not on MSL3-MOF.

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DNA which only females have - Phys.org


Jun 4, 2015 ... In birds, the females have their own sex chromosome, the ... ... with a W chromosome seems instead to depend upon the number of their equivalent ... The W chromosome is the only chromosome from the cell nucleus which is ...

Chromosome - What's a Genome?


Jan 15, 2003 ... ... like bits of fat thread, and are kept in the nucleus, a sphere-shaped sac within the cell. ... Exactly how many chromosomes we are talking about depends on the species. ... and thousand ways to purringly manipulate human beings, have only 38. ... In humans, a female has two identical sex chromosomes.

DNA that only females have -- ScienceDaily


Jun 4, 2015 ... ... other animals with a W chromosome seems instead to depend upon the number of ... "This is because it is only inherited on the maternal side and fewer ... Males produce a vastly greater number of germ cells than females and so ... The W chromosome is the only chromosome from the cell nucleus which ...