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lesantik [10]
3 years ago
7

Describe a DNA molecule and its shape

Biology
2 answers:
LekaFEV [45]3 years ago
8 0

Answer:

DNA is a long molecule, made up of two strands twisted together to make a spiral known as a double helix.

Fiesta28 [93]3 years ago
4 0
The DNA molecule is shaped like a ladder that is twisted into a coiled configuration called a double helix. The nitrogen bases form the rungs of the ladder and are arranged in pairs, which are connected to each other by chemical bonds.
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What are 3 mechanisms for reproductive isolation which mechanisms isolates two populations of similar frogs with different matin
ryzh [129]

Answer:

Behavioral isolation

Explanation:

The reproductive isolation refers to the mechanism which prevents the interbreeding between the organism. The mechanisms of reproductive isolation can be categorised into two types: The pre-zygotic and post-zygotic barriers.

The prezygotic isolation mechanisms are the behavioural, the habitat, mechanical and gametic isolation.

In the given question, the type of mechanism involved in the population of frog will be the "behavioural isolation" as the population of frog differ in their behaviour of mating ritual or mating calls which does not allow the frogs to mate.

Thus, Behavioral isolation is the correct answer.

7 0
4 years ago
Freckles are dominant over no freckles. Stacey is hybrid for freckles. Her husband, Charlie, does not have any. If they have fou
ozzi

Answer:

2 children will have freckles

Explanation:

This question is just a play on words for the punnet square. You have a dominate trait , freckles, and a recessive trait, no freckles. Charlie has no genes for freckles, so he will be represented as 2 lower case letters. Stacey has both types of genes for freckles and no freckles, so she will be represented as 1 capital letter and 1 lowercase letter. I'll try to make a punnet square down below. Capital A represents the dominate trait and lowercase a represents the recessive trait.

         A            a

a       Aa          aa

a       Aa          aa

As you can see, 2 of her children have the dominate trait for freckles, and two of her children only have recessive traits, which means no freckles:)

7 0
3 years ago
Read 2 more answers
Which factor causes the greatest increase in an area's flash flood risk?
leonid [27]
Can be a number of things, rain fall quota, climate, population, vegetation..any of those.
5 0
4 years ago
Read 2 more answers
What level of organization that is a group of tissues working together?
ANEK [815]

Answer:

Organs

Explanation:

Tissues are groups of similar cells that have a common function. An organ is a structure that is composed of at least two or more tissue types and performs a specific set of functions for the body. Many organs working together to accomplish a common purpose is called an organ system.

5 0
3 years ago
Read 2 more answers
Please help Complete the sentence.
vekshin1

Answer:

The mutation in the MCR1 <em>gene </em>affected the structure and function of the MCR1 <em>protein</em>.

7 0
2 years ago
Read 2 more answers
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