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zheka24 [161]
3 years ago
6

Studies in which the suprachiasmatic nucleus (SCN) was surgically removed from laboratory mammals demonstrated that the SCN is r

equired for circadian rhythms. But these studies did not reveal whether circadian rhythms originate in the SCN. To answer this question, researchers performed an SCN transplant experiment on wild-type and mutant hamsters (Mesocricetus auratus). For wild-type hamsters, the period between cyclic peaks in activity is 24 hours in the absence of external cues. Hamsters homozygous for the τ (tau) mutation have a period lasting only about 20 hours. In this exercise, you will evaluate the design of this experiment and propose additional experiments to gain further insight. The researchers surgically removed the SCN from wild-type and τ hamsters. Several weeks later, each of these hamsters received a transplant of an SCN from a hamster of the opposite genotype. These transplants restored rhythmic activity in 80% of the hamsters. For hamsters in which an SCN transplant restored a circadian rhythm, the researchers measured the circadian period. The results are shown in the graph. Each red line represents the change in the measured period for an individual hamster. Part A - Understanding the experimental design In a controlled experiment, researchers manipulate one variable at a time. What was the experimental variable in this study?
Biology
1 answer:
Alex777 [14]3 years ago
3 0

Answer:

yo no se

Explanation:

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Cross a person who does not have freckles and is heterozygous for dimples with a person who has
Alja [10]

Answer:

1. 1/2

2. 1/2

3. 1/4

Explanation:

Let the allele for freckles be A or a while that of dimples be B or b.

A person without freckles but heterozygous for dimples = aaBb

A person who has freckles (whose mother has no freckles) but no dimples = Aabb

      aaBb    x    Aabb

Offspring

4 AaBb - freckled and dimpled

4 Aabb - freckled and non dimpled

4 aaBb - non freckled and dimpled

4 aabb - non freckled and non dimpled

1. <em>Probability that the parents will have a dimpled child</em> = 8/16 or 1/2

2. <em>Probability that they will have a child with freckles</em> = 8/16 or 1/2

3. <em>Probability that they will have a child with freckles and dimples</em> = 4/16 or 1/4

<u>See the attached image for the Punnet's square analysis of the cross</u>

4 0
3 years ago
New crust and hydrothermal vents forms at ridges formed at a ______________ boundary.
natita [175]

Answer:

Option B, Divergent Boundary

Explanation:

The tectonic plates moving around form the divergent boundary and at this boundary magma from inside the earth rises to form new crust on the lithosphere beneath the water. Most of the divergent plate boundaries are present below the water where they form oceanic spreading ridges (submarine mountain ranges). The process of formation of oceanic spreading ridges is volcanic.

Hence, option B is correct

7 0
3 years ago
the term applied when water passes through a selectively permeable membrane from an area of high to low concentration is
AleksandrR [38]
The process is called osmosis.
5 0
3 years ago
Ribosomes offer strong support for the common ancestry of all living things. In particular, our textbook shows information that
Daniel [21]

Answer:Yeast and Bacterial ribosomes have the same number of rRNAs in them

4 0
3 years ago
Which of the following would not be found in blood serum?
arsen [322]

Answer:

Antibodies

Explanation:

6 0
3 years ago
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