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tiny-mole [99]
3 years ago
15

Under normal conditions, when cells are not in contact with other cells this will signalthem to divide. When cells are too close

ly packed together they will stop dividing.These are examples of ______________ signals.
A. external
B. chemical
C. internal
D. None of the above
Biology
2 answers:
iren2701 [21]3 years ago
8 0
It is an example of external contact. The correct option is A.
Nitella [24]3 years ago
7 0
A. external
These types of signals are observed when there is a cut on the body. The epidermal cells lose contact with one another and divide faster until they are in contact once again. After they come into contact, division slows down again.
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Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele.
VashaNatasha [74]

Answer:

a. Heterozygous individuals may pass on their copy of the disease-causing allele to offspring.

Explanation:

Tay-Sachs, which is a recessive lethal disease  ---- Let say the recessive lethal diseases is s

∴ it only results when an individual posses two copies of the diseases-causing allele i.e two copies of the disease will be ss.

Now, when two hetrozygous individuals crossed , it is obvious that each can pass on their copy of the disease-causing allele to the offspring.

Let show an illustration for the above statement.

Let the heterozygous individual be Ts, if Ts cross with another Ts;

we will have:

Ts × Ts

         T          s

T        TT        Ts

s        Ts          ss

the offspring are TT,Ts,Ts,ss

We can now see how the Heterozygous individuals pass on their copy of the disease-causing allele to the offspring (Ts).

8 0
3 years ago
What do the limiting factors actually limit?
Tasya [4]
Limiting factors are resources or other factors in the environment that can lower the population growth rate. Limiting factors include a low food supply and lack of space. Limiting factors can lower birth rates, increase death rates, or lead to emigration.
3 0
3 years ago
What can get cancer and what must it have in order to get cancer?
Zigmanuir [339]
Everyone could get cancer, most likely people who has a bad immune system, cancer develop when cells starts to reproduce in a certain way. There’s different types of cancer.
3 0
3 years ago
What are the adaptations of bottle-nosed dolphins that allows them to thrive in the marine biome?.
3241004551 [841]

Answer:

Thermoregulation

Explanation:

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  2. Increased insulation. Dolphins deposit most of their body fat into a thick layer of blubber.
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5 0
2 years ago
List the order of Producers that colonize the land After Lichens
olasank [31]

Answer:

Plant is a common example of a Producer.

Producers are also known as autotrophs.They are organisms which make their own food. They do so by getting energy from chemicals or the sun and with the help of water convert the energy into useable forms such as sugar.

The order of Producers that colonize the land After Lichens include

Annual herbaceous plants

Perennial herbaceous plants and grasses

Shrubs

Shade intolerant trees

Shade tolerant trees.

8 0
3 years ago
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