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2 years ago

What chemical makes up the rungs (as if it were a ladder)? lesson DNA

1 answer:

8 0

In DNA, the "rungs" between the two strands of DNA are formed from the nitrogenous bases adenine, thymine, guanine and cytosine

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Fruit flies have eight pairs of chromosomes. Calculate the genetic possibilities from independent assortment of a zygote made fr

Furkat [3]

Answer:

256

Explanation:

If there are 2 pairs of chromosomes Aa and Bb, there are 4 possibilities for independent assortment of gametes:

A w B, aith with b, A with b and a with B.

If there are 3 pairs of chromosomes Aa, Bb and Cc, there are 8 possibilities:

ABC, abc, ABc, Abc, aBC, aBc, abC, AbC

This corresponds to 2^n, where n= the number of chromosomes.

Therefore, with 8 chromosomes, the possibilities are 2^8 = 256

This is for each parent.

8 0

2 years ago

Read 2 more answers

The removal of soil or sediment by wind and moving water or ice is called

GuDViN [60]

Hello!

Your answer would be erosion.

Erosion means to "move" sediments through wind, water, etc.

Weathering means to break down something.

Decomposition means to decay.

Hope this helps! Have a amazing day! ~Pooch ♥

3 0

2 years ago

Read 2 more answers

How can a robin have a ddt concentration of 444 ppm even though the soil contains only 10 ppm of ddt

zaharov [31]

Robin can have a ddt concentration of 444ppm while the ddt concentration of soil is 10 ppm. This happens due to biological magnification.

<u>Explanation:</u>

In biological magnification the concentration of toxic substances at successive trophic levels keeps increasing. Due to biomagnification, what starts out as a small concentration grows while moving to successive trophic levels. DDT is a pesticide which is used to kill pests that affect crops.

DDT used in farms gets deposited in the soil. From the soil it can reach various trophic levels. At each trophic level its concentration keeps increasing.

Robin is a bird that is a secondary consumer and thus belongs to the higher trophic level. Thus even if the DDT concentration is as low as 10ppm in the soil its concentration will keep increasing and can become a high value like 444ppm.

3 0

2 years ago

HELP PLEASE I WILL MARK BRAINLIEST

natta225 [31]

Answer:

The answer is 0.2

Explanation:

You subtract 8.05 - 7.85 = 0.2

3 0

2 years ago

Why would plants have pigments that are not photosynthetically active

QveST [7]

Pigments absorb light used in photosynthesis.Set of wavelengths that a pigment doesn't absorb are reflected.

3 0

3 years ago