BIOLOGY HIGH SCHOOL

A cell has damaged DNA, which checkpoint is responsible for checking this? A: m checkpoint B: G2 checkpoint C: G1 checkpoint

Answers

Answer 1
Answer: The answer is B: G2 checkpoint.

Cell cycle checkpoints are control mechanisms necessary for proper cell division. In the cell cycle, there are two checkpoints: the G1 checkpoint and the G2 checkpoint. The G1 checkpoint is right before the S phase, and G2 checkpoint is right before the M phase.
The G2 checkpoint is a DNA damage checkpoint and if DNA is damaged, entering the cell cycle is delayed before mitosis (M phase).
Answer 2
Answer:

Answer:

B

Explanation:

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Which of the following is an example of gene flow?
The Pennsylvania Dutch Amish have historically been a small, isolated population in the United States. Within this population, there is a different frequency of alleles than there is throughout the population of southern Germany and Switzerland from which they came. Given this information, how is it possible that polydactyly, or the condition where people have extra fingers and toes, is more common within this group? Please choose the correct answer from the following choices, and then select the submit answer button.
Which statement does not describe a human cell?a) has a nucleus with thousands of different genes b) has specific active genes in response to environment c) transcribes bacterial and human DNA d) transcribes certain genes at certain times ***please provide explanation if possible

In genetics, the dash symbol (–) is a "wild card" that stands for either the dominant allele or the recessive allele; for example, A– means the individual has either the genotype AA or Aa. Two genes that undergo independent assortment affect flower color in sweet peas. Each gene as two alleles, one of which is dominant for flower color. Genotypes of the form A– B– have purple flowers, whereas those of the form A– bb, aa B–, and aa bb have white flowers. What ratio of purple : white is expected from the cross Aa Bb × Aa Bb? Hint: This type of epistasis is known as "duplicate recessive epistasis."
A. 9:7
B. 10:6
C. 12:4
D. 13:3
E. 15:1

Answers

Answer:

Option A, 9:7

Explanation:

Given,

Genotype of A-B- have purple color

A-B-  have genotype AABB, AaBb, AaBB, AABb

While genotype of A– bb, aa B–, and aa bb have white flowers

A– bb have genotype - AAbb, Aabb

aa B– have genotype aaBb, aaBB

Cross between Aa Bb and AaBb will give following offspring

AB         Ab         aB          ab

AB AABB AABb AaBB AaBb

Ab AABb AAbb AaBb Aabb

aB AaBB AaBb aaBB aaBb

ab AaBb AAbb aaBb aabb

So the possible genotypes and their corresponding phenotypes are  

AABB-1 (Purple)

AABb-1 (Purple)

AaBB-3 (Purple)

AaBb -4 (Purple)

AAbb-2 (White)

Aabb-1 (White)

aaBB-1 (White)

aaBb-2 (White)

aabb-1 (White)

Purple : White = 9:7

What is ethology? A) the study of animal behavior

B) the study of animal taxonomy

C) the study of animal physiology

Answers

A. The study of animal behavior

Answer: A) The study of animal behaviour.

Explanation: B) the study of animal taxonomy is called taxonomy.

C) the study of animal physiology is zoology.

With that being said, we are left with A being the correct choice.

This picture represents:A atoms of an element
B molecules of an element
C molecules of a compound
D a mixture

Answers

The fundamental building blocks of matter or the smallest units of an element are called atoms. This picture represents atoms of an element, Therefore, the correct option is A.

Each element consists of a distinct set of atoms, each of which has a certain number of protons in its nucleus. The vast variety of matter found in the universe is made up of the combination of these atoms into molecules and compounds. To understand the chemical processes, bonding, and properties of materials, one must have a thorough understanding of the structure and behavior of atoms.

Therefore, the correct option is A.

Learn more about Atoms, here:

brainly.com/question/1566330

#SPJ3

Answer:

I think D

Explanation:

A result of harmful fishing practice where part of the catch is discarded and not used is called overfishing

 supertrawling

 bycatch

 longlining

I think its either by catch or over fishing

Answers

When part of the catch is discarded and not used is called a "bycatch". This occurs when other, usually smaller fish, get caught by accident by fishermen hoping to catch other kinds of fish.
A result of harmful fishing practice where part of the catch is discarded and not used is called Bycatch.

Aim on how does the dominant hand and non-dominant hand react to stimulus

Answers

The dominant hand will most probably be faster to react and will also react more strongly in comparison to the non-dominant hand. The reason for this is that our dominant hand tends to be better at reacting towards stimuli in comparison to our non-dominant hand. 

The body's ongoing process of regulating its internal environment- electrolyte balance, blood chemistry, temperature, and so on- is called?

Answers

The answer is homeostasis.

The homeostasis is an organism's ability to maintain a stable internal environment. Example of homeostasis include the regulation of electrolyte balance, blood chemistry, temperature.
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