Term
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Definition
| refers to sexual phenotype |
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Term
| Fundemental difference between males and female. |
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Definition
| Females produce relativly larger gametes than males. |
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Term
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Definition
| The mechanism by which sex is established. |
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Term
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Definition
| both sexes are present in an organism |
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Term
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Definition
bearing both reproductive structures
"one house" |
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Term
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Definition
species in which organisms bear either male or female reproductive structures
humans |
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Term
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Definition
| chromosomes that determine sex |
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Term
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Definition
| the non sex chromosomes that are the same for male and female |
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Term
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Definition
| males produce "two different types of gametes with respect to the sex chromosomes" |
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Term
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Definition
| females produce "gametes that are all the same with respect to the sex chromosome" |
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Term
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Definition
XY chromosome
they are able to pair because these chromosomes are homologous at small regions |
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Term
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Definition
| sex is determined by the number of chromosomes |
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Term
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Definition
No Sex Chromosomes
Genotypes at one or more loci determine the sex of an individual plant or protozoan. |
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Term
| sequential hermaphroditism |
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Definition
An organism that changes sex throughout the course of its lifetime.
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Term
| How is Fly sex dertermined? |
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Definition
"Genic Balance"
By a balance between genes on the autosomes and genes on the X chromosome
X:A ratio - the number of x chromosomes divided by the number of haploid sets of autosomal chromosomes |
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Term
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Definition
Female
1 in 3000
Short
Low Hairline
Broad Chest
Neck Folds
Sterile
A single X chromosome
XO |
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Term
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Definition
Male
1 in 1000
XXY
XXXY
XXXXY
XXYY
Small testies
Reduced facial and pubic hair
Taller and Sterile
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Term
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Definition
"triplo-X syndrome"
Infant cells possess 3 X chromosomes
Tall and Thin
Greater chance of retardation
XXXX or XXXXX greater retardation risk |
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Term
| Male Sex Determining Gene |
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Definition
sex-determining region Y (SRY) gene
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Term
| Androgen-insensitivity syndrome |
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Definition
A female with an XY genotype
The androgen receptor is absent and there is nowhere for the testosterone to bind to
The femaes cells are insensitive to testosterone
carried on the X chromosome |
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Term
Sex-linked Characteristics
X-Linked Genes
Y-Genes |
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Definition
characteristics determined by genes located on the sex-chromosome
X-linked - genes on the X chromosome
Y-linked - genes on the Y chromosome |
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Term
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Definition
possession of a single allele at a locus.
ex: males possess a single x chromosome |
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Term
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Definition
| when the 2 X-chromosomes in females fail to separate in Anaphase I of meiosis |
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Term
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Definition
| equalizes the amount of protein produced by x-linked genes in the two sexes |
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Term
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Definition
| an inactivated x-chromosome made visible by staining |
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Term
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Definition
| That the Barr Body was an inactive X chromosome |
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