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padilas [110]
3 years ago
11

Identify the state of DNA (just DNA, in a plasmid, or in a virus) that is transferred from one organism to another in transforma

tion. Explain Griffith’s experiment including if rough and smooth strains of S. pneumonia are pathogenic or nonpathogenic and how the rough strain was changed into a smooth strain of the bacteria?
Biology
1 answer:
just olya [345]3 years ago
5 0

Answer:  The correct answer is :  The state of the DNA that is transferred from one organism to another is Naked DNA.

Griffith's experiment went like this:

* Rough strain

* do not cap

Smooth strain

* capsule

* virulent (pathogenic) avirulent

Through DNA-mediated transformation, bacteria enter the DNA

Smooth strain (capsule) -> killed the mouse

Rough strain (no capsule) -> no effect on mouse

Heat killed smooth strain -> no effect on mouse

Heat killed smooth strain + living rough strain mixed -> killed the mouse

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Answer:

1 black : 1 orange

Explanation:

This is a typical monohybrid cross involving a single gene coding for eye color in MendAlien. The allele for black eyes (B) is dominant over the allele for orange eyes (b). In an heterozygous state, Bb i.e. combination of both dominant (B) and recessive (b) alleles, the MendAlien will be phenotypically black.

In a cross between a heterozygous MendAlien (Bb) and an orange-eyed MendAlien (bb), two of the offsprings will have a Bb genotype and be phenotypically black-eyed which the other two will have a bb genotype and be phenotypically orange-eyed. Thus, a phenotypic ratio of 2 Bb : 2 bb will be obtained.

This is also equal to 1:1 i.e. 1 black-eyed : 1 orange-eyed.

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