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2 years ago

Is natural selection the only means of evolution? Explain.

Biology

1 answer:

Sunny_sXe [5.5K]2 years ago

3 0

Answer:

Much change is due to random genetic drift rather than positive selection. Some are harmful and are likely to be eliminated by natural selection – by death of the embryo, for instance. ...

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Write the chemical formula for each of the following compounds. Start the formula with the first element listed in each statemen

Anika [276]

Answer:

C3H8O= C3 + H8 + O

Explanation:

You do not need to write the one for oxygen, yo can if desired

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3 years ago

The seeds of flowering plants, angiosperms, have similar parts. The part of the seed that is responsible for protecting the deve

slava [35]

Seeds perform various functions for the plants that generate them, among them the essential function is dispersal to a new location, nourishment of the embryo, and dormancy at the time of inappropriate conditions.

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3 years ago

What would happen to the enzyme phosphatase if we decrease the PH to 3

Maurinko [17]

Answer:

it will ex plode

Explanation:

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3 years ago

Differences in traits are called

Tcecarenko [31]

Answer:

The observable traits expressed by an organism are referred to

EXPLANATION:

An organism's underlying genetic makeup, consisting of both physically visible and non-expressed alleles, is called its genotype. Mendel's hybridization experiments demonstrate the difference between phenotype and genotype.

3 0

3 years ago

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