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3 years ago

How do scientists use DNA to support evolution?

2 answers:

8 0

DNA supports evolution because it carries genetic information. This genetic information is then passed on to offspring through DNA, which basically allows traits to be inherited, which allows natural selection to take place because the better genes survive, it carries the information and variation that ultimately fuels natural selection, driving evolution.

guapka [62]3 years ago

3 0

DNA supports evolution because all life on Earth carries DNA, and evolution happens only after DNA changes. These changes are called mutations and happen spontanoulsy from flawed DNA copying or from mutagens, such as X-rays or chemicals.

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In beans the pod texture and growth form genes are located on different chromosomes. There are two varieties of beans in a farme

irina1246 [14]

Answer:

a. Genotype in F1 - TtBb

Phenotype in F1 - tough pods, bush-type growth

b. Proportion of F2 that are heterozygous for bush-type growth form = 5/8

c. Proportion of the F2 with tender pods = 1/4

d. Proportion of F2 that are heterozygous for growth form and have tender pods = 1/8

Explanation:

Since the two traits are located on different chromosomes, they will independently assort during gametes formation. T is dominant over t and B is dominant over b.

Two true-breeding varieties were crossed at the beginning of the program:

TTBB x ttbb

All F1 plants will have the genotype TtBb with tough pods and bush-type growth form.

Advancing the cross to F2:

TtBb x TtBb

Progeny

1 TTBB - tough pods, bush-type

2 TTBb - tough pods, bush-type

2 TtBB - tough pods, bush-type

4 TtBb - tough pods, bush-type

1 TTbb - tough pods, climbing-type

2 Ttbb - tough pods, climbing-type

1 ttBB - tender pods, bush-type

2 ttBb - tender pods, bush-type

1 ttbb - tender pods, climbing-type

Proportion of F2 that are heterozygous for bush-type growth form = 10/16 = 5/8

Proportion of the F2 with tender pods = 4/16 = 1/4

Proportion of F2 that are heterozygous for growth form and have tender pods = 2/16 = 1/8

7 0

3 years ago

20 POINTS!!!!!!!!!!!!!!

ASHA 777 [7]

Answer:

Its a substitution mutation because one of the specific base, G is replaced by A.

This is a Point Mutation because Point mutation brings changes in the structure of a gene because of the substitutions with another base pair. Like in this case, G is substituted by A. In case of frameshift mutations, there is a change in the number of nucleotides due to either insertions or deletions of the nucleotides, which is not in this case.

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2 years ago

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How to identify oxygen and carbon dioxide?

Genrish500 [490]

Answer:

Place a glowing splint in the test tube, and if it reignites, it could be oxygen. Place a burning splint into a test tube, and if it goes out, it could be carbon dioxide. Or, place carbon dioxide gas in limewater, and if it turns milky and gets chunks, it is carbon dioxide.

6 0

3 years ago

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In what ways is a euglena like all other cells?

swat32

Euglena are like all other cells because they grow and reproduce. They obtain nutrients by taking in other microorganisms an make their own food by using the energy from sunlight.

4 0

2 years ago

The prefix "hypo" means

Naily [24]

Answer:

low, under, beneath, down, or below normal

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2 years ago

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