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
Veronika [31]
3 years ago
13

Carbon dioxide and oxygen enter and exit a leaf by diffusion. which structure(s) on a leaf allow(s) this process to happen?

Biology
1 answer:
Montano1993 [528]3 years ago
3 0
The stomata and their guard cells allows this happen.

Stomata is like a hole or gap on a leaf, most of them are present in a bottom side of the leaf, since waxy cuticle is not present over there. And 2 guard cells make up a stomata.

Guard cells are able to control the size of the stomata, depending on the situation. For example, the guard cells close up during day time because a lot of sunlight may cause more water loss.

In conclusion, guard cells and the stomata are the main structures that allow carbon dioxide and oxygen (water too) diffuse in and out of leaves.
You might be interested in
What’s the eighth planet from the sun ?
mr_godi [17]

Answer:

neptune

Explanation:

4 0
3 years ago
Read 2 more answers
According to the data above, humans exhibit a high chance of surviving into old age.
Rom4ik [11]

Based on the data provided, we can conclude that the graph in question corresponds to the K-selected theory in regards to the human species.

When considering the data of certain species and grouping them into categories such as extinct, endangered, or K/r-selected we take into account factors such as:

  • Population size
  • Behavior
  • Carrying capacity
  • Reproduction rates

and so on, then classify each species accordingly.

Species that are Extinct are no longer on the earth. This classification refers to species of the past and does not include humans as of yet. The endangered category is reserved for species whose population sizes are <u>at a critical low and are near </u><u>extinction</u>, which is also not the case for humans.

The K-selected and r-selected theories consider reproduction rates and carrying capacity as well when grouping species. Species that produce few offspring at a time are often found in this group. This category also refers to species whose offspring have a high chance of survival into maturity and whose population size is near the limit of the environment. All of this follows the data given and is the classification for the human species.

To learn more visit:

brainly.com/question/13046597?referrer=searchResults

3 0
2 years ago
ITS DUE TODAY PLEASE HELP!!!<br> (sorry I keep asking for help, the teachers give me a lot of tests)
Alika [10]
B it’s 500 million years old
3 0
3 years ago
Which process can transport substances against the concentration gradient?
anzhelika [568]

Answer:

The answer to your question is: Active transportation

Explanation:

Cell can move molecules in or out of it by two processes: Active or Passive transport.

Active transport:  is the movement of molecules against a concentration gradient. Use proteins or enzymes to happen.

Passive transport: is the movement of molecules or ions from a higher concentration to a lower concentration.

7 0
3 years ago
The curly toe phenotype is controlled by 4 genes that act in an additive manner. The environment does not have an effect on this
Sergio [31]

Answer:

  1. What is the highest number of risk units an individual can have with this model? 48 units of risk
  2. What is the phenotype of an individual of genotype AaBbCCDd? The individual has curly toes
  3. Is it possible for them to have a child with curly toes?

        Yes, the couple can have children with curly toes.

Explanation:

<u>Available data</u>:

  • The curly toe phenotype is controlled by 4 diallelic additive genes
  • Genes A, B, C, D  
  • A dominant allele has 6 units of risk
  • A recessive allele has 2 units of risk
  • Individuals with more than 35 units of risk have curly toes
  • Individuals with 35 or fewer risk units have straight toes

The term quantitative heritability refers to the transmission of a phenotypic trait in which expression depends on the additive effect of a series of genes.  

Polygenic heritability occurs when a trait results from the interaction of more than one gene. And these genes can also have more than two alleles. The action of many genes and alleles can cause many different combinations that are the reason for genotypic graduation.  

Quantitative traits are those that can be measure, such as longitude, weight, eggs laid per female, among others. These characters do not group individuals by any precise and clear categories. Instead, they group individuals in many different categories that depend on how the genes were intercrossed and distributed during meiosis. The result depends on the magnitude in which each allele contributes to the final phenotype and genotype. When they interact, they create a gradation in phenotypes, according to the level of contribution.

According to this information, and knowing how each allele contributes to the risk, we can say that the minimum units of risk are 16, determined by the recessive genotype aabbccdd. Each recessive allele contributes with 2 units of risk, so (aa=4units + bb=4 units + cc=4 units + dd=4 units) =  16 units.

Each time a dominant allele is present in the genotype, it adds 6 units to the total risk.    

What is the highest number of risk units an individual can have with this model?

48 units of risk, which corresponds to the genotype AABBCCDD. Each dominant allele contributes 6 units to the risk. There are 8 dominant alleles, so, 8x6=48 units.

What is the phenotype of an individual of genotype AaBbCCDd?

The individual has curly toes because it has a risk of 36 units, which is superior to the limit of 35 units. Dominant alleles A, B, C, C, D contribute with 30 units of risk (6x5), and recessive alleles a, b, d contribute 6 units of risk (3x2).

Cross:

Parentals) AAbbCcDd   x   AaBbCCDd

Gametes) AbCD, AbcD, AbCd, Abcd

               ABCD, ABCd, AbCD, AbCd, aBCD, aBCd, abCD, abCd

Punnett square)  AbCD                 AbcD               AbCd               Abcd

          ABCD    AABbCCDD     AABbCcDD     AABbCCDd     AABbCcDd

          ABCd    AABbCCDd      AABbCcDd     AABbCCdd      AABbCcdd

          AbCD    AAbbCCDD      AAbbCcDD    AAbbCCDd     AAbbCcDd

         AbCd     AAbbCCDd       AAbbCcDd     AAbbCCdd     AAbbCcdd

         aBCD     AaBbCCDD      AaBbCcDD      AaBbCCDd     AaBbCcDd

         aBCd     AaBbCCDd      AaBbCcDd      AaBbCCdd     AaBbCcdd

         abCD     AabbCCDD      AabbCcDD      AabbCCDd    AabbCcDd

         abCd      AabbCCDd      AabbCcDd      AabbCCdd        AabbCcdd

F1) 16 /32 = 1/2 individuals in the progeny are expected to have curly toes

     16 /32 = 1/2 individuals are expected to have straight toes

Is it possible for them to have a child with curly toes?

Yes, the couple can have children with curly toes.

To have curly toes, individuals must have more than 35 units of risk.

To have more than 35 units, individuals´ genotypes must carry at least 5 dominant alleles (which equal 30 units).

8 0
3 years ago
Other questions:
  • In humans, polydactyly (an extra finger on each hand or toe on each foot) is due to a dominant gene. When
    12·2 answers
  • Is this statment true or false ?? the united states population grows when more people are born worldwide each year than die worl
    9·1 answer
  • Distinguish the role of hydrometeorologists and explain their significance.
    14·1 answer
  • Oysters and barnacles are in competition for space on a rock. Which of the following best describes this relationship?
    6·2 answers
  • What is the scientific name of a giraffe using
    12·2 answers
  • Which sub-phase of the interphase does the cell spend the most time in ?
    5·2 answers
  • - Key Concept Describe the<br> functions of the cell membrane<br> and cell wall.
    9·1 answer
  • Changes in DNA that sometimes do and sometimes don't have a harmful effect are called what?
    14·2 answers
  • The three basic components of all connective tissues are
    15·1 answer
  • Which statement accurately describes planetesimals
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!