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Fiesta28 [93]
3 years ago
13

The two main sources of genetic variation are:______. a) single-gene traits and polygenic traits. b) directional selection and d

isruptive selection. c) genotypes and phenotypes. d) gene shuffling and mutations.
Biology
1 answer:
tangare [24]3 years ago
7 0

Answer:

d) gene shuffling and mutations.

Explanation:

During meiosis-I, the exchange of genetic segments between the homologous chromosomes occurs. This is called crossing over. The recombinant chromatids formed during crossing over have new combinations of alleles that were otherwise not present in the parental chromatids. Similarly, the random assortment of alleles of different genes towards the opposite poles of the cell during anaphase-I also creates new gene combinations. These events of gene shuffling during meiosis recombine the genetic material and add genetic variations in the progeny.  

When genetic material undergoes any random change in its sequence, the corresponding mRNA sequence is also altered. This results in the formation of faulty, nonfunctional, less functional or no protein from the mutated mRNA. Therefore, the sudden changes in DNA called mutations also add variations.

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Multiple Choice
Lesechka [4]

Answer:

decreases a plant’s weight

Explanation:

Aerobic respiration is a process of respiration in which oxygen is required and the byproducts of aerobic respiration are carbon dioxide, water and energy.

Plants undergo aerobic respiration and it is a catabolic process in which complex compounds in plants turns into simpler compounds. This process reduces the dry weight of the plants.

Glycolysis is the first step in both aerobic and anaerobic respiration so it is not a typical aerobic respiration.

Hence, the correct answer is "decreases a plant’s weight".

3 0
3 years ago
Which answer explains the relationship between excessive pumping of ground water and the impact it has on humans.
taurus [48]
Your questions answer is D
8 0
3 years ago
Does the size of the particles change as a substance changes state
Kazeer [188]
Ok, particle is not a very nice word, no real sense of size associated with it
it can be a group of molecules like a speck of sand
referring to the molecules themselves
or refering to the atoms that make up the molecule

now in terms of phase change,
if we consider a speck- a group of molecules- then solids will expand when heated, however this definition falls flat in terms of phase change

ok, how about molecules, as molecules undergo phase change, the molecules in relation to each other will move apart from one another. Solid- molecules are bonded, Liquids- molecules are close and flow around each other, Gas- molecules are a significant distance from one another. But the increase in size when you heat up a molecule, i would have to say yes. adding heat increases energy which increases molecular vibration which would probably  increase the overall average size to some unnoticeable degree.

now standalone atoms are just atoms, if you want to consider the electron cloud as size, then heating it up would negligibly cause the outer move outward. but it really depends on the scale of the question
7 0
3 years ago
The animals located on the top of the pipe that nemo finally comes out of are
iris [78.8K]
Crabs are the animal located on the top pipe that Nemo finally comes out. 
Nemo is taken by a diver, Marlin a clownfish sett off a journey to rescue Nemo. Two crabs surround in the pipes, fighting for the scraps which appear to the bubbles. 
8 0
3 years ago
Using the diagram, which of the structures is the oldest?<br><br> H<br> F<br> M<br> B
Anna35 [415]
I would say B so yea...hope ur day doing well
6 0
2 years ago
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