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gregori [183]
3 years ago
8

Describe the cloning process of Dolly the sheep.

Biology
2 answers:
spin [16.1K]3 years ago
7 0
Dolly<span> (</span>sheep<span>) </span>Dolly<span> (5 July 1996 – 14 February 2003) was a female domestic </span>sheep<span>, and the first mammal </span>cloned<span> from an adult somatic cell, using the </span>process <span>of nuclear transfer.</span>
antiseptic1488 [7]3 years ago
3 0
How Dolly was cloned

Animal cloning from an adult cell is much more difficult than from an embryonic cell. So when scientists working at the Roslin Institute in Scotland produced Dolly, the only lamb born from 277 attempts, it was a major news story around the world.

To produce Dolly, scientists used an udder cell from a six-year-old Finn Dorset white sheep. They had to find a way to 'reprogram' the udder cells - to keep them  alive but stop them growing – which they achieved by altering the growth medium (the ‘soup’ in which the cells were kept alive). Then they injected the cell into an unfertilised egg cell which had had its nucleus removed, and made the cells fuse by using electrical pulses. The unfertilised egg cell came from a Scottish Blackface ewe. When the research team had managed to fuse the nucleus from the adult white sheep cell with the egg cell from the black-faced sheep, they needed to make sure that the resulting cell would develop into an embryo. They cultured it for six or seven days to see if it divided and developed normally, before implanting it into a surrogate mother, another Scottish Blackface ewe. Dolly had a white face.

From 277 cell fusions, 29 early embryos developed and were implanted into 13 surrogate mothers. But only one pregnancy went to full term, and the 6.6 kg Finn Dorset lamb 6LLS (alias Dolly) was born after 148 days.

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the first wave of extinction may be related to rapid cooling at the end of the Ordovician Period, and the second phase is widely regarded as having been caused by the sea-level fall associated with the glaciation.

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Explain 3 main steps in the process of DNA replication
podryga [215]

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A group of snails (of the same species) lives in a garden that also includes beetles and tomato plants. what level(s) of ecologi
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8 0
3 years ago
When a horse and a donkey have an offspring, it is called a mule--a hybrid that cannot reproduce itself. Why are horses and donk
RUDIKE [14]

Answer:

Horses and donkeys are two different species but belong to the same family Equidae and the genus Equus. They both have different numbers of chromosomes.

Although they look quite similar in appearance, there are many dissimilarities.

The physical differences between horses and donkeys include:

Donkeys backs are flatter than horses.

Donkeys have smaller hoofs than horses.

Donkeys have longer and thicker ears than horses.

Horses tend to have a long face than Donkeys.

Horses have six vertebrates, while donkeys have only five.

Tails of horses and donkey differ. Horses have long tails, whereas donkey’s tail looks like a cow’s tail.

On the genetic level, the total number of chromosomes in the horse is 64 and donkey have 62 number of chromosomes. Mule is a hybrid of a female horse and a male donkey. Hinny is a hybrid of a female donkey and a male horse. Both the offspring (hybrid offspring) produced by donkeys and horses are infertile, sterile, cannot have its own offspring and both have 31 pairs of chromosomes each.

If the produced offspring is fertile then the animals are of the same species and if the produced offspring is sterile then they are of different species. Because of this, both horses and donkeys are considered as a separate species. A species is generally defined as a group of organisms, which are capable of interbreeding and creating viable offspring. In this case, mule and the hinny are not really a new species and are produced by two different species.

4 0
3 years ago
Read 2 more answers
Heartworms can infest the hearts of animals like cats and dogs. The worms get nutrients from the animal, while the animal will d
tester [92]

Parasitism

Explanation:

This relationship in which the heartworms gets nutrient from the host and in the process, the host eventually dies from infestation is known as parasitism.

  • The organism that houses the heartworm is called the host
  • The heartworm in itself is called the parasite.
  • Parasitism is a positive - negative relationship in which one organism feeds on the other and causes harm to it in the process.
  • Plasmodium falciparum is the parasite of malaria in man.
  • In commensalism, one organism depends on the other without causing harm to it. Example is cattle and egret.
  • Mutualism is a positive - positive relationship in which both organism derives benefits from the other. Example is lichen.

learn more:

Interactions brainly.com/question/2321688

#learnwithBrainly

6 0
3 years ago
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