What is the answer to number 1

Answer:

Applications:

- silence gene expression of target genes

- activate gene expression of target genes

- determine the role of DNA methylation and histone modifications (methylation, acetylation, etc) on specific regulatory sites (e.g., enhancer sequences)

Explanation:

The CRISPR/Cas9 system can be repurposed to edit the epigenome of living cells. For this purpose, it is required 1-to fuse a catalytically inactive 'dead' Cas9 enzyme with enzymes involved in epigenetic mechanisms (e.g., DNA methyltransferases, histone deacetylases, etc) capable of activating or deactivating gene expression, and 2-to design single-guide RNAs (sgRNAs) complementary to the sequence of interest (i.e., target sequences whose epigenome landscape we are trying to modify). For example, dCas9 gene has been fused with the DNA methyltransferase 3a (Dnmt3a) gene to create a dCas9-DNMT3A complex which can be combined with a specific sgRNA in order to study the effects of DNA methylation at a particular gene. These CRISPR/Cas9-mediated epigenome editing systems have shown to be very useful to understand how epigenome drives chromatin folding and dynamics at specific genomic sites (loci), and thus regulate gene expression at the transcriptional level.

Answer:

100% Heterozygous Dominant (Rr)

Hope this helps!

Answer:

1. mammary glands

2. vertebral column

3. four limbs  

Explanation:

Whales and humans have many more detailed features in common (homologies) than do whales and fish because whales and humans share a most recent common ancestor. Whales and humans are mammals (Class Mammalia), whereas fish are not mammals. First, both whales and humans have mammary glands: whales have mammary glands on the chest and stomach (like other mammals). Second, nearly all mammals have a vertebral column composed of 7 cervical vertebrae (humans and whales are not an exception to this rule). Like other mammals, whales have four limbs: although whales are adapted to live underwater, they evolved from a terrestrial mammal ancestor that once walked on four legs (about 50 million years ago).

Answer:

Both species share a common ancestor that lived when the Earth had supercontinents

Explanation:

Gondwana was a supercontinent that existed about 550 million years ago (Neoproterozoic Era) and began to break up about 180 million years ago (Jurassic period). During this period, Gondwana gradually broke up into the continents we know at present, and it has been proposed that about 140 million years ago Africa/South America started to separate from Australasia/India/Antarctica (Cretaceous period). On the other hand, DNA testing is a method based on the comparison of genetic sequences that can help to determine the ancestral history of different individuals, populations and species by determining the homology level between DNA sequences. In this case, sequence homology can be used to infer evolutionary relationships between species separated by a geographic barrier (i.e., South America and Australia are separated by the Pacific Ocean), thereby suggesting the existence of past supercontinents and also suggesting that both species share a common ancestor that lived when the Earth had such supercontinents.

Answer: The follicle assumes a new role which is:

--> the secretion of hormone PROGESTERONE and

--> OESTROGEN

Explanation:

The cycle in the female reproductive system of humans which tak s 28dayd to complete is known as menstrual cycle. At the beginning of the menstrual cycle, several primary oocytes begin to develop. Each oocyte is surrounded by actively dividing granular cells from which it receives nutrients. The whole structure is called a FOLLICLE.

A developing follicle secretes OESTROGEN.

Usually, only one of the developing follicles becomes mature to produce an ovum. As the follicle matures, it becomes filled with fluid and the oocyte is pushed to one side. Ovulation occur when there is release of an ovum from a mature follicle.

The ruptured mature follicle develops into a CORPUS LUTEUM which is a solid yellow body that secretes the hormone PROGESTERONE. This is the hormone that helps to maintain the early stages of pregnancy if fertilization and implantation of embryo occurs. In the absence of pregnancy, the corpus luteum shrivels.

In a female, several main oocytes begin to mature at the start of the menstrual cycle. Each of the oocyte is surrounded by granular cells that are actively dividing and provide it with nourishment forming a ball like mass structure. This structure is known as a follicle.

After the release of a mature oocyte from the ovary, the follicle it was released from takes on a new role and becomes the Corpus luteum.

The ruptured mature follicle after releasing the one main oocyte that develops into the egg develops into a Corpus Luteum. This structure functions in the secretion of the hormone known as progesterone.

If fertilization and embryo implantation occur, this hormone helps to maintain the early stages of pregnancy. The corpus luteum shrinks in the absence of pregnancy.

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Answer:

The cell body, or soma, contains the nucleus of the cell and its associated intracellular structures. Dendrites are specialized extensions of the cell body.

Explanation:

Answer:

blastopore

Explanation:

Involution is the second stage after invagination during frog gastrulation. Involution occurs at the blastopore when the marginal zone cells get to the tip of the blastopore, make an inward turn and then move along the inner exterior of the outer cells sheets.

This means that the cells found at the lip of the blastopore and always undergoing change and the first of these cells to develop into the dorsal lip are the endodermal cells. Next are the mesoderm cells that form the Notochord.

Answer:

4 beats

Explanation:

The number of beats of the heart that will take blood from Aorta to The Brain

n = Distance  from Aorta to brain / distance per beat

Given that distance per beat = 7.5 cm ( calculated value outside scope of question  using the data attached below)

n = 30 cm / 7.5 cm

  = 4 beats

The correct answer is B. A theory is why something happens and a law is how something happens.

Explanation

A scientific theory is a way of describing why chemical and physical phenomena originate. An example of this can be the theory of Charles Darwin on the Evolution of species. In this theory, Darwin set out to explain why the evolution of species and what influenced this development. On the other hand, a scientific law is a description of how some of the phenomena of nature occur. For example, Isaac Newton's Law of Universal Gravitation was intended to describe the gravity. From the above, it can be inferred that the correct answer is B. A theory is why something happens and a law is how something happens.

Answer:

A

Explanation:

As with DNA replication, partial unwinding of the double helix must occur before transcription can take place, and it is the RNA polymerase enzymes that catalyze this process. ... The DNA molecule re-winds to re-form the double helix. In the first step, transcription, the code in the DNA is copied to a different nucleic acid, RNA.  In the second step, translation, the nucleic acid code in RNA is changed into a new form: amino acids. This step is called translation because the nucleic acid language is being "translated" into the protein language.

Answer:

his friend can push the rock with him (on the left side) for his friend could pull (from the right side)

Answer:

Males can pass either X or Y to their offspring's

Explanation:

Males determine the age (not on purpose) females have the kid

Males can pass either an X or a Y chromosome to their offspring, while females can pass only an X chromosome to their offspring. Therefore, the statement that is true regarding the way in which sex chromosomes are passed on to offspring is: "Males can pass either an X or a Y chromosome to their offspring."

Sex chromosomes determine the sex of an individual and are responsible for the inheritance of sex-linked traits. In humans, there are two sex chromosomes: X and Y. Females have two X chromosomes, while males have one X and one Y chromosome.

During sexual reproduction, the sex chromosomes are passed on to offspring from their parents. The father can pass on either an X or a Y chromosome to his offspring, while the mother can only pass on an X chromosome. This means that the sex of the offspring is determined by the father's contribution of either an X or Y chromosome.

If the father contributes an X chromosome, the offspring will be female (XX). If the father contributes a Y chromosome, the offspring will be male (XY). This means that while the mother's contribution is always an X chromosome, the father's contribution determines whether the offspring will be male or female.

Sex-linked traits, such as color blindness and hemophilia, are carried on the X chromosome. Because females have two X chromosomes, they can be carriers of these traits without exhibiting symptoms themselves. However, males only have one X chromosome, so they are more likely to exhibit symptoms of sex-linked traits if they inherit a faulty gene on that chromosome.

Overall, the inheritance of sex chromosomes plays an important role in determining the sex of an individual and can influence the inheritance of sex-linked traits.

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Answer:

repulsion (trans)

Explanation:

Repulsion refers to the phenomenon by which each homologous chromosome contains one dominant and one recessive allele from two different linked genes. A trans arrangement occurs when an individual is heterozygous for two linked genes, where the recessive allele for one particular gene is located on the same chromosome as the dominant allele for the other linked gene, thereby dominant and recessive alleles are said to be “in repulsion”. Conversely, a cis arrangement occurs when both dominant alleles are located on one chromosome and both recessive alleles on the other.

Answer:

Map & Compass. Technology can be a great tool, especially with GPS, however it's important to not solely depend on your smartphone when you're lost in the backcountry. ...

First-Aid Kit. ...

Signal Mirror. ...

Fire Starter. ...

Water Purification System. ...

Knife. ...

Cordage. ...

Fishing Line and Hooks.

Answer:

knife, lighter, flashlight, portable camp,

Explanation:

Answer:

The answer is c because different types and species of organisms can live in the same habitat so the mere fact that both organisms live in the same habitat doesn't mean they are closely related.

Answer:

3

Explanation:

Answer: 4

Explanation: THE OTHER ANWSER IS WRONG

Answer:

True

Explanation:

The calcitonin/calcitonin gene-related peptide (CALCA) gene is used to encode different peptide sequences (i.e., calcitonin hormone, calcitonin-related peptides and katacalcin) through alternative RNA splicing. These peptides have different functions. Calcitonin is a hormone mainly produced by cells of the thyroid gland, which is involved in the control of levels of calcium and phosphate in the blood. Moreover, katacalcin is a peptide synthesized from the same precursor of calcitonin (and therefore also mainly produced by cells of the thyroid gland), which is implicated in both calcium regulation and skeletal maintenance. Finally, the calcitonin gene-related peptide (CGRP) is a peptide mainly produced by sensory nerves (type Aδ fibers ), which is involved in pain pathways. The CALCA gene has attracted considerable attention from geneticists because it is specifically expressed in neuroendocrine tissues in normal conditions and abnormally induced in septic conditions (i.e., during the body's extreme response to an infection).

Answer:

Explanation:

A TGCACT

The correct complementary base pair for the DNA sequence ACGTGA is TGCACT (Option A).

In conclusion, the correct complementary base pair for the DNA sequence ACGTGA is TGCACT (Option A).

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Answer:

Boil water into steam

Explanation:

As the turbine blades turn, they drive generators that make electricity. Nuclear plants cool the steam back into the water in a separate structure at the power plant called a cooling tower, or they use water from ponds, rivers, or the ocean. The cooled water is then reused to produce steam.

Answer:

D

Explanation:

Answer:

The answer for this question is that sex-linked.

Answer:

I think the answer is a gene mutation.

Explanation:

A gene mutation is a change in one or more genes.

Answer:

true

Explanation:

An air mass acquires its characteristics from the region over which it forms, called its source region. ... Cold air masses tend to flow toward the equator, and warm air masses tend to flow toward the poles. This movement of air masses brings heat to cold area

Answer:

Negative feedback

Explanation:

Try to bring the variable (temperature) down to normal set point is negative feedback

Answer:

10 %.

Explanation:

Only 10 % of energy in the producers of an ecosystem will be available to secondary consumers of that ecosystem while the remaining 90 % will be lost and releases in the atmosphere in the form of heat energy. In each trophic level, only 10 % of the total biomass is transferred from one trophic level to another trophic level while the remaining biomass is released in the form of heat. If the producers has 1000 calories of energy, only 100 calories will be transferred to the primary consumer.