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algol13
3 years ago
10

Results in four daughter cells, each with half the number of chromosomes of the parent cell, as

Biology
1 answer:
BartSMP [9]3 years ago
6 0

Answer:

Meiosis

Explanation:

Meiosis, becose of the two parts of meiosis the parent cell is divided twice creating four cells called gametes

Mitosis create two identical daughter cells and is for all other body cells except for gametes (sex cells)

fertilization results in a new organism

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A DNA fragment is introduced into the lacZ gene of a plasmid, which also contains an ampicillin resistance gene. What is the app
zhenek [66]

Answer: The bacteria transformed with this particular plasmid will form white colonies on the plates containing ampicillin and Xgal.

Explanation: The lacZ gene produces an enzyme called β-galactosidase which is responsible for the breakdown of lactose into glucose and galactose. The lacZ gene is one of the three genes (the other two being lacA and lacY) of the lac operon which is responsible for the transport and mechanism of lactose in E. coli and many other bacteria.

In recombinant DNA technology, when a plasmid is to be used to transform a host cell, such markers are used to help screen the transformed cells from the ones that have not taken up the plasmid. Xgal present in the plates is an artificial substrate which is hydrolyzed by

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This is called blue-white screening which is used to identify successfully transformed host cells. A picture of this is given in the attachment, taken from the following website:

https://www.mun.ca/biology/scarr/Blue_&_White_Colonies.html

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