1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
astra-53 [7]
3 years ago
12

The lymphatic system is composed of all of the following except

Biology
1 answer:
zlopas [31]3 years ago
6 0

OPTIONS:

A) lymphatic vessels.

B) the venae cavae.

C) the spleen.

D) lymph nodes.

E) lymph.

Answer:

B) the venae cavae.

Explanation:

The lymphatic system is an organ system that consists of a network of lymphoid tissues, lymphatic vessels and organs, which perform functions such as removal of toxins and unwanted materials, as well as production of immune cells that helps primarily in fighting against infection.

Lymphatic vessels, the spleen, lymph nodes, and lymph are all part of the lymphatic system.The venae cavae are two large vessels that empty deoxygenated blood received from all parts of the body into the right atrium. They are not part of the lymphatic system.

You might be interested in
C. the absorptive cells that line the wall of the intestine are called
Valentin [98]
Enterocytes is the answer.
8 0
3 years ago
4) A homozygous groucho fly ( gro, bristles clumped above the eyes) is crossed with a homozygous rough fly (ro, eye abnormality)
docker41 [41]

Answer and Explanation:

  • A homozygous groucho fly ( gro, bristles clumped above the eyes) is crossed with a homozygous rough fly (ro, eye abnormality).
  • The F1 females are testcrossed, producing these offspring: groucho 518 rough 471 groucho, rough 6 wild-type 5 1000 a) What is the linkage distance between the two genes? B) Plot the genes on a map c) If the genes were unlinked and the F1 females were mated with the F1 males, what would be the offspring in the F2 generation?

1st cross:

Parental) grogro ro+ro+ x  gro+gro+ roro

F1) gro+gro ro+ro

2nd cross:

Parental)  gro+gro ro+ro   x  grogro roro

Gametes) gro+ro+                       gro ro

                gro+ro                         gro ro

                gro ro+                        gro ro

                gro ro                          gro ro

Punnet square)  

                   gro+ro+             gro+ro              gro ro+            gro ro  

gro ro    gro+gro ro+ro   gro+gro roro    grogro ro+ro    grogro roro

gro ro    gro+gro ro+ro   gro+gro roro    grogro ro+ro    grogro roro

gro ro    gro+gro ro+ro   gro+gro roro    grogro ro+ro    grogro roro

gro ro    gro+gro ro+ro   gro+gro roro    grogro ro+ro    grogro roro

F2)

0.518 grogro ro+ro (518 individuals)

0.471 gro+gro roro (471 individuals)

0.006 grogro roro (6 individuals)

0.005 gro+gro ro+ro (5 individuals)

Total number of individuals 1000

<u><em>Note</em></u>: These frequencies were calculated dividing the number of individuals belonging to each genotype by the total number of individuals in the F2.

To know if two genes are linked, we must observe the progeny distribution. <em>If individuals, whos </em><em>genes assort independently,</em><em> are test crossed, they produce a progeny with equal </em><em>phenotypic frequencies 1:1:1:1</em>. <em>If</em> we observe a <em>different distribution</em>, that is that <em>phenotypes appear in different proportions</em>, we can assume that<em> genes are linked in the double heterozygote parent</em>.  

In the exposed example we might verify which are the recombinant gametes produced by the F1 di-hybrid, and we can recognize them by looking at the phenotypes with lower frequencies in the progeny.  

By performing this cross we know that the phenotypes with lower frequencies in the progeny are groucho, rough and wild-type. So the recombinant gametes are <em>gro+ro+</em> and <em>gro ro</em>, while the parental gametes are <em>gro+ro</em> and <em>gro ro+.</em>

So, the genotype, in linked gene format, of the double heterozygote individual in the <u>F1</u> is gro+ro/gro ro+.

To calculate the recombination frequency we will make use of the next formula: P = Recombinant number / Total of individuals. The genetic distance will result from multiplying that frequency by 100 and expressing it in map units (MU). One centiMorgan (cM) equals one map unit (MU).

The map unit is the distance between the pair of genes for which one of every 100 meiotic products results in a recombinant product.

The recombination frequency is:

P = Recombinant number / Total of individuals

P = 6 + 5 / 1000

P = 11 / 1000

P = 0.011

The <u>genetic distance between genes,</u> is 0.011 x 100= 1.1 MU.

<u>Genetic Linkage Map:</u>

Parental Phenotypes)  

-----gro+------ro----              -----gro------ro+----

----- gro ------ro----               ---- gro------ ro ----

Recombinant phenotypes)

-----gro+------ro+----              -----gro------ro----

----- gro ------ ro----                -----gro------ro----

<u>If the genes were unlinked</u> and the F1 females were mated with the F1 males, the offspring in the F2 generation would have been

4/16 = 1/4 gro+gro ro+ro  

4/16 = 1/4 gro+gro roro  

4/16 = 1/4 grogro ro+ro    

4/16 = 1/4 grogro roro

Their phenotypic frequencies would be 1:1:1:1 related.                                                  

7 0
3 years ago
Which is not considered to be an enhancer to transcription in the metallothionein 2a gene?
alisha [4.7K]

PZ120 is not considered to be an enhancer to transcription in the metallothionein 2a gene.

<h3>About metallothionein 2A.</h3>

Metallothionein-2 is a metallothionein protein that in humans is encoded by the MT2A gene.

In human it is expressed in;

  • pericardium
  • right lobe of liver
  • olfactory bulb
  • left uterine tube
  • external globus pallidus
  • right lobe of thyroid gland
  • upper lobe of left lung
  • Region I of hippocampus proper
  • right lung
  • left lobe of thyroid gland

It's molecular function are;

  • Protein ion binding
  • Zinc ion binding
  • Metal ion binding

It helps in various biological processes;

  • response to metal ion
  • cellular response to interleukin-3
  • cellular response to erythropoietin
  • negative regulation of growth
  • cellular response to zinc ion
  • interferon-gamma-mediated signaling pathway
  • cellular copper ion homeostasis
  • cellular zinc ion homeostasis
  • detoxification of copper ion
  • cellular response to cadmium ion
  • cellular response to copper ion
  • nitric oxide mediated signal transduction
  • response to bacterium

To learn more about Metallothionein 2a,

brainly.com/question/13962194

#SPJ4

7 0
2 years ago
A frog That catches and eats a grasshopper is a what
NISA [10]

the frog is now a predator


7 0
3 years ago
Read 2 more answers
In which sections or section of the kidney is the urine formed? what section of the kidney collects the urine? how does the urin
torisob [31]

In which sections or section of the kidney is the urine formed? 

The final product of filtration, reabsorption, and secretion which is the urine is primarily formed in the renal medulla although the formation of the urine starts with the filtration of blood in the glomerulus then along the proximal tubules, descending and ascending loop of Henle, distal tubules, and collecting ducts. 


What section of the kidney collects the urine? 

The renal pelvis is the main section of the kidney that collects the urine. The renal pelvis arises from the confluence of the collecting ducts forming the renal papilla then the minor calyx and the major calyx and ultimately to the renal pelvis to be transported to the urinary bladder through the ureters.


How does the urine move from the kidney out of the body? 

The urine will be collected in the renal pelvis. With the urine collected in the renal pelvis, the urine moves from the renal pelvis to the urinary bladder through the ureters and will be stored in the urinary bladder. When there is an urge to urinate, the urinary bladder contracts and the urethral sphincter relaxes that allows passage of the urine from the bladder out of the body through the urethra.


In which main regions of the kidney are the glomerulus and the Bowman's capsule located? 

The glomerulus and the Bowman’s capsule are part of the renal cortex. These organs are responsible for the filtration of the blood from the afferent arteriole. The glomerulus and the Bowman’s capsule are not synonymous but rather the glomerulus comes from the afferent arteriole and the Bowman’s capsule functions as a filtration membrane. Together, they are called the renal corpuscle.


In which main regions of the kidney are the collecting ducts and the loop of Henle located?

The collecting ducts are located in the renal medulla whereas the loop of Henle are partly in the medulla, depending on the type of nephron. In superficial cortical nephrons, the dips only up to the outer medulla while in the juxtamedullary nephrons, the glomerulus is near the corticomedullary border wherein more parts of the loop of Henle is in the medulla.

3 0
3 years ago
Other questions:
  • The names of the molecules I created are ______ and_____
    8·2 answers
  • What types of plant cells have chloroplasts?
    12·2 answers
  • According to Sternberg, _____ love has strong components of sexuality and infatuation, and it often predominates in the early pa
    9·1 answer
  • 5 sentence on importance of including vegetables in diet
    9·1 answer
  • Please help! 100 points! please help!
    6·2 answers
  • The solar system formed from a(n)_________, which is a rotating cloud
    9·1 answer
  • Write a summary statement for unsaturated fats including whether they are solids or liquids at room temperature and whether they
    9·2 answers
  • Can someone do this for me on paper
    9·1 answer
  • True or False. Anything that has molecules doesn’t have heat. Explain your answer.
    8·2 answers
  • YOU GUYS PLEASE HELP ME ITS URGENT AND ITS ABOUT ATOMS IM STRUGGLING PLEASE​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!