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Molodets [167]
3 years ago
6

Which of these genotypes are heterozygous? A: TT B: Tt C: tt D: none of these

Biology
2 answers:
sesenic [268]3 years ago
6 0

Answer:

B

Explanation:

Heterozygous genotypes are those that have one dominant allele and one recessive allele.

Dominant alleles are represented as capital letters, while recessive alleles are represented as lowercase letters. So, a heterozygote should have one capital letter and one lowercase letter.

Looking at the answer choices, only B fits this, so it's the answer.

Hope this helps!

Ghella [55]3 years ago
6 0

Answer:

B: Tt

Explanation:

Heterozygous mean two different alleles.  B is the answer because it has two different alleles, Tt.

I hope this helped you.

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Arthropod exoskeletons and mollusc shells both ________.a.are secreted by the mantleb.help retain moisture in terrestrial habita
nasty-shy [4]

Answer:

b. help retain moisture in terrestrial habitats

Explanation:

Arthropods such as cockroach, centipedes, spiders, crab are the members of the largest phylum Arthropoda. These are animals with paired jointed legs and their body is covered with an exoskeleton made of chitin. They live in diversified habitat and exoskeleton helps to retain moisture in theterrestrial habitats.

Similarly mollusks such as sepia, snail are soft bodied animal whose body is covered with calcareous shell as a protection and to retain moisture while living on land.

8 0
3 years ago
When referring to cell division, oncogenes are most like ________ while tumor suppressor genes are most like ________. the brake
Inga [223]

Oncogenes are most like the gas pedal on a car, while tumor suppressor genes are most like the brakes on a car. Oncogenes and tumor suppressor genes are mutated in cancer cells.

Oncogenes are genes overexpressed in cells in which they should not be expressed, thereby leading to cancer.

Some examples of oncogenes are growth factors such as, for example, the  Platelet-derived growth factor (PDGF) or Epidermal growth factor (EGF).

Conversely, tumor suppressor genes are genes that act to regulate cell division and replication, thereby their inactivation also leads to cancer.

A well-known example of a tumor suppressor gene is the p53 gene that acts to control cell division and apoptosis (programmed cell death).

Learn more in:

brainly.com/question/14662375

5 0
3 years ago
Which of the following is an example of homeostasis? A. During a time of high stress, Justin's heart races, his muscles tense, a
pychu [463]

Answer:

C.

Explanation:

Homeostasis refers to the tendency for the human body to attempt to maintain a certain state even during changes in environment, activity, intake, etc. Options A, B, and D all refer to instances where the body departs from its usual state. While the scenario in Option C does describe a change in environment, it also describes the reaction of the body that brings its internal systems back to a certain state of fluid level.

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caffeine increases activity not only in the brain but also in the branch of the nervous system serving the body. this branch is
g100num [7]

The appropriate response is peripheral.

<h3>What exactly does being nervous mean?</h3>
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<h3>What functions does the nervous system perform?</h3>

Your nervous system uses neurons, which are specialized cells, to send impulses and messages throughout your body. Your muscles, organs, glands, skin, and brain all send and receive electrical signals. The communications allow you to move your limbs and feel things like pain.

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#SPJ4

4 0
1 year ago
Whats the word for a large number of species in an ecosytem?
luda_lava [24]
A biodiversity
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6 0
3 years ago
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