Nhamba yeChromosome: Hwaro hweMajini eHupenyu
Machromosome maumbirwo emakromosomu anowanikwa mumasero anoita basa rakakosha mukuchengetedza nekuronga ruzivo rwemajini. Chipenyu chega chega chine huwandu hwakasiyana hwemakromosomu, izvo zvinosarudza chimiro chemajini acho. Chinyorwa chino chichaongorora huwandu hwemakromosomu mumarudzi akasiyana-siyana, kukosha kwawo, uye kuti anopesvedzera sei hunhu hwezvinhu zvipenyu nekushanduka-shanduka.
Tsanangudzo uye Maumbirwo eChromosomes
Machromosome ane DNA yakaputirwa nemapuroteni anonzi histones. Izvi zvinoumba chimiro chakabatana, chakarongeka, zvichibvumira kuchengetwa kwakanaka kwemashoko ezvemajini. Muvanhu, machromosome ari mukati menucleus yesero uye ane maDNA marefu, akatenderera, ane zviuru zvemajini anoronga mirairo yezvehupenyu inodiwa pakukura, kukura, uye kushanda kwechisikwa chega chega.
Kukosha kweChromosome Number
Nhamba yechromosome chinhu chakakosha mumajini nekuti ndiyo inosarudza kugadzikana kwegenome yechisikwa. Kazhinji, nhamba yechromosome ine chekuita zvakananga nekugona kwechisikwa kubereka nekupona. Semuenzaniso, vanhu vane ma chromosome maviri nematatu, ese ari makumi mana nematanhatu. Pama chromosome aya makumi maviri nematatu, makumi maviri nemaviri anozivikanwa se autosomes, uye peya imwe ndiyo chromosome yechikadzi, iyo inosarudza bonde remunhu: XX yevakadzi uye XY yevarume.
Kusiyana kweNhamba yeChromosome muMhando dzakasiyana
Huwandu hwemachromosome hunosiyana zvakanyanya pakati pemarudzi akasiyana. Semuenzaniso:
– Vanhu (Homo sapiens): machromosome makumi mana nematanhatu.
- Bhiza (Equus ferus caballus): 64 chromosomes.
- Imbwa (Canis lupus familiaris): 78 chromosomes.
- Katsi (Felis catus): makumi matatu nemasere machromosomes.
– Chibage chirimwa (Zea mays): machromosome makumi maviri.
Munyika yezvirimwa, kusiyana kwehuwandu hwemachromosome kunogona kutonyanya kushamisa. Mimwe miriwo ine mazana kusvika kuzviuru zvemachromosome. Chiitiko ichi chinonzi polyploidy, chinoitika kana zvipenyu zviine maseti anopfuura maviri emachromosome. Semuenzaniso, zvirimwa zvegorosi nembatatisi zvinowanzoratidza polyploidy.
Mhedzisiro yeChromosome Number paKushanduka-shanduka
Huwandu uye chimiro chemachromosome zvinoita basa guru mukushanduka kwezvipenyu. Kuchinja kwehuwandu kana chimiro chemachromosome kunogona kutungamira kuchinjo huru mumagadzirirwo emajini echipenyu. Semuenzaniso, kusangana kana kupatsanurwa kwemachromosome kunogona kutungamira ku speciation, kuumbwa kwemarudzi matsva.
Muenzaniso mumwe wakakurumbira ndewekushanduka kwechromosome 2 muvanhu. Vanhu vane chromosome imwe shoma pane hama dzavo dzepedyo, chimpanzee, idzo dzine 48. Kuongorora majini kunoratidza kuti chromosome 2 yemunhu imhedzisiro yekubatanidzwa kwemachromosome maviri emadzitateguru akasiyana mumhuka dzemhuka.
Nhamba yeChromosome Inokanganisika
Hazvisi zvipenyu zvese zvinoramba zvine nhamba yemakromosomu yakafanana. Zvisizvo zvemakromosomu zvinowanzoonekwa uye zvinogona kukanganisa hutano hwevanhu, kunyanya pahutano hwevanhu. Mamwe mamiriro ezvinhu emajini anokonzerwa nemakromosomu akawandisa kana asipo, anozivikanwa seaneuploidy. Mienzaniso yemamiriro aya inosanganisira:
– Down syndrome: Inokonzerwa nekuvapo kwekopi yechitatu yechromosome 21. Vanhu vane chirwere ichi vanowana mwero wakasiyana wekukanganisika kwepfungwa uye kukura kwemuviri.
– Turner syndrome: Chirwere chinoitika mumadzimai kana imwe yemachromosomes eX isipo zvachose kana kuti zvishoma, zvichikonzera huwandu hwemachromosomes makumi mana nemashanu.
– Klinefelter syndrome: Chirwere chemurume chinosanganisira kuva nechromosome X imwe chete kana kupfuura, kazhinji 47,XXY.
Zvidzidzo izvi zve aneuploidy hazvina kukosha chete pakuongororwa kwekiriniki uye majini, asiwo zvinopa ruzivo rwakakosha rwekuti kusiyana kwemakromosomu kunogona sei kukanganisa phenotype.
Tsvakurudzo uye Kufambira Mberi muChromosome Studies
Kufambira mberi kwetekinoroji mu molecular biology kwakaita kuti pave nekutsvagurudza kwakawanda pamusoro pema chromosomes nenhamba yawo. Nzira dzakadai se karyotyping, iyo inotibvumira kuona ma chromosomes pasi pemaikorosikopu, uye nzira dzemazuva ano dzakadai se genome sequencing dzakachinja kunzwisisa kwedu chimiro nemashandiro ema chromosomes.
Tsvagiridzo yechromosome inewo mashandisirwo anoshanda mukurima nemukurapa. Semuenzaniso, nekushandisa huwandu hwemachromosome mumiti, masayendisiti anogona kugadzira mhando itsva dzinotsungirira zvirwere zvakanyanya kana kuti dzine goho rakawanda. Mukurapa, kunzwisisa machromosome nemagene kunobatsira mukuvandudzwa kwekurapa kwemajini uye mushonga chaiwo unotarisa zvirwere zvemajini.
Mhedziso
Nhamba yechromosome chinhu chakakosha mu genetic biology chinopesvedzera mashandiro nekushanduka kwezvisikwa. Kusiyana kwenhamba dzechromosome muzvisikwa kunopa ruzivo rwakadzama pamusoro pekuti hupenyu hunochinja sei uye hunobudirira sei mumamiriro akasiyana-siyana ezvakatipoteredza. Sezvo tekinoroji nenzira dzekutsvagisa dzichiramba dzichifambira mberi, kunzwisisa kwedu ma chromosome kucharamba kuchikura, zvichibatsira kugadzirisa zvakavanzika zvemajini zvisina kugadziriswa uye kupa mhinduro itsva kumatambudziko emangwana ehutano nekurima.
