Biology - 4BI1 PearsonEdexcel

Cloning

Bayani Gaba-gaba

In 1996 a single sheep made headlines around the world. Dolly was the first mammal cloned from an adult body cell, proving that a fully differentiated cell still contains all the genetic information needed to build an entire organism. Cloning - producing genetically identical copies - is not just a laboratory curiosity: it underpins a huge plant propagation industry and opens the door to producing human proteins from animal milk.

This topic covers plant cloning through micropropagation (tissue culture), the stages of adult cell cloning as illustrated by Dolly, and the use of cloned transgenic animals to manufacture valuable human proteins. You will explore the advantages, limitations, and ethical questions surrounding each technique.

Manufura

Describe the process of micropropagation (tissue culture) in which explants are grown in vitro
Understand how micropropagation can be used to produce commercial quantities of genetically identical plants with desirable characteristics
Describe the stages in the production of cloned mammals involving the introduction of a diploid nucleus from a mature cell into an enucleated egg cell, illustrated by Dolly the sheep
Understand how cloned transgenic animals can be used to produce human proteins

Takardar Darasi

Gardeners have been cloning plants for centuries - every time you take a cutting from a favourite rose bush and grow it into a new plant, you are producing a genetic clone. Modern tissue culture scales this up dramatically: from a few cells scraped off a parent plant, laboratories can generate thousands of identical plants in weeks. Animal cloning is harder, but Dolly the sheep showed it was possible, and the technique now has practical applications in medicine.

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Nazarin Darasi

Barka da kammala darasi akan Cloning. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

What is an explant in micropropagation? A) A mature plant grown from seed B) A small piece of plant tissue taken from the parent C) A genetically modified seed D) A root cutting from an adult plant Answer: B
In the cloning of Dolly the sheep, where was the diploid nucleus taken from? A) An egg cell B) A sperm cell C) A body cell of an adult sheep D) An embryonic cell Answer: C
What triggers the enucleated egg cell to start dividing in adult cell cloning? A) Fertilisation by a sperm B) An electric shock C) Addition of hormones D) Exposure to UV light Answer: B
Which of the following is a disadvantage of cloning plants? A) The plants grow too quickly B) All plants are genetically identical so equally vulnerable to disease C) The plants cannot photosynthesise D) Cloned plants cannot reproduce Answer: B
What is pharming? A) Growing crops on fish farms B) Using cloned transgenic animals to produce human proteins in their milk C) Selective breeding of dairy cattle D) Fermenting milk to make yoghurt Answer: B