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marysya [2.9K]
3 years ago
8

Jordan is doing a science fair project on the effects of music on the growth of tomatoes. He has two tomato plants, Plant A and

Plant B, that he grows in a window and gives the same amount of water. Plant A is exposed to classical music using headphones attached to the soil. Throughout the growth period, Jordan counts the number of tomatoes produced by each plant.
List one of the experimental constants in this experiment.
Biology
2 answers:
GREYUIT [131]3 years ago
8 0
An expiremental constant is the amount of water and sunlight, the variable is the music
balandron [24]3 years ago
6 0

Answer:

Water and sunlight are the experimental constants.

Explanation:

As we know, scientific experiments are composed of variables (dependent and independent) that are factors that researchers can manipulate to provoke a reaction that allows them to observe results. What few know is that in addition to variables, experiments are composed of factors called "constants". Experimental constants are factors that are maintained in the same way throughout the experiment without being manipulated. An example of this can be seen in the question above, where the researcher used as constant the amount of water supplied to plants and the amount of sunlight.

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In guinea pigs, black fur (B) is dominant over white fur (b) and rough fur (R) is dominant over smooth fur (r). A cross between
kvv77 [185]

Answer:

2. independent assortment.

Explanation:

According to law of independent assortment, any allele of a gene governing one trait may assort with just any other allele of another trait. As a result of which different combinations of phenotypes may arise.

According to the question given:

black fur (B) is dominant over white fur (b)

rough fur (R) is dominant over smooth fur (r)

A cross between BbRr x BbRr will produce 16 off-springs with genotypes mentioned as under:

BBRR = 1 → Black fur, rough fur

BBRr = 2 → Black fur, rough fur

BBrr = 1 → Black fur, smooth fur

BbRR = 2 → Black fur, rough fur

BbRr = 4 → Black fur, rough fur

Bbrr = 2 → Black fur, smooth fur

bbRR = 1 → White fur, rough fur

bbRr = 2 → White fur, rough fur

bbrr = 1 → White fur, smooth fur

It may be noted here that there are 16 progeny with 4 types of phenotypes mentioned as under:

Black fur, rough fur = 9

Black fur, smooth fur = 3

White fur, rough fur = 3

White fur, smooth fur = 1

We are able to get these results just because of so many allelic combinations formed out of the law of independent assortment.

Rest of the options like intermediate inheritance, multiple alleles and codominance do not apply on these results.

Intermediate inheritance is when we get a blended trait that is grey color but no such phenotype was observed.

Multiple allelism is when there is an existence of a third type of phenotype which is entirely different from both the phenotypes which we didn't observe here.

Codominance is when both the alleles show equal impact like if the guinea pigs had a phenotype which had patches of white and black color then it could be codominance. But here we did not observe any such phenotype.

6 0
3 years ago
How is this marked wrong wouldnt it be 18 cm ?
andreev551 [17]

Answer:

14 cm

Explanation:

Oh, this is a trick question! The thing is, the plant was <u>already 4 cm </u><u>on Day 0</u>. So from Day 0 - Day 15, the plant actually only grew (18 - 4 =)  14 cm.

They got you this time, but hopefully you know to watch out next time. I hope this helps!

7 0
3 years ago
Drag and drop the ocean zones to order them from shallowest to deepest
____ [38]
1.Sunlight zone
2.Twilight zone
3.Midnight Zone
4.Abyssal zone
7 0
3 years ago
All proteins are synthesized by ribosomes in the cell. Some ribosomes float freely in the cytosol, while others are bound to the
harkovskaia [24]

Answer:

777

Explanation:

7878878

6 0
3 years ago
Read 2 more answers
Cell-to-cell communication is absolutely essential for multicellular organisms. But how do plants communicate when their cells a
nevsk [136]

Ans.

Cell-to-cell communication allows signalling of essential substances between the plant cells, which are surrounded by cell walls. The molecules used by plants for long-distance signalling are known as hormones, such as auxin, ethylene, and gibberelin.

These hormones are secreted by one plant cell and received by another plant cell, where it exerts it affect. Thus, the correct answer to be fill in the blank is 'option A). hormones.'

3 0
3 years ago
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