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genetics 6
genetics chapter 6
| Question | Answer |
|---|---|
| Ducts that determine gender | mullerian=female, wofian = male, occurs during the sixteh week when the SRY is activated |
| Heterogametic | sex with two different sex chromosomes, male |
| Homogametic sex | sex with two of the same chromosomes, female |
| Y chromosome contains many | palindromes which cause folding issues, destabilizes it, may allow it to recombine with themselves |
| Pseudoatosomal regions | ends of the Y chromosome PAR1 and PAR2, counterparts on the X that can cross over with them |
| MSY | male specific region, the bulk of the Y chromosome, nonrecombining, almost no protein encoding genes here |
| Transcription factor | protein encoded by SRY gene which controls expression of other genes, stimulates male development by sending signals to gonads, secrete anti-mullerian hormone |
| Genetics and homosexuality | identical twins are more likely to be gay than fraternal or the everyday population, believe it is on the X chromosome |
| Homosexuality also appears to be caused by | serotonin levels |
| Y linked are more rare than X linked | |
| Hemizygous | male is considered hemizygous for X linked traits because he only has one |
| X inactivation | balances the inequality of having 2 X chromosomes, one of the Xs in each cell is randomly turned off |
| X inactivation center | specific region that shuts off the rest of the X chromosome, XIST controls it |
| Barr body | the left over part of the X chromosome that has been inactivated |
| No matter which X chromosome is turned off | the same allele is left ot be expressed |
| Manifesting heterozygote | carrier of an X linked trait who expresses the phenotype (female), tortoiseshell nd calico cats, the earlier the activation the larger the patches |
| Sex-limited trait | affects a structure or function of the body that is present in only males or females, such as milk production and beard growth, preeclampsia |
| Sex-influenced traits | an allele is dominant in one sex but recessive ein the other, male pattern baldness which is dominant ain males ian drecessive in females |
| Genomic imprinting | methyl groups cover a gene or several linked genes and prevent them from being accessed to synthesize proteins which results ina disease being more severe, epigenetic alteration |
| Epigenetic alteration | a layer of meaning is stamped upon a gene without changing its DNA sequence, passed from cell to cell in mitosis, but not passé din meiosis |
| Genes from a female parent direct different actilivites than gnes from a male parent | oocyte controls embryo growth while sperm controls placenta, why clones are unhealthy |
| Calliphage goats | only malesXwild type produced calliphage lambs |
Created by:
reidabook
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