Answer:
Natural selection is still influencing the evolution of a wide variety of human traits, from when people start having children to their body mass index, reports a study published Monday in the journal Proceedings of the National Academy of Sciences.
Explanation:
Answer:
Explanation:
an example is the ability to endure the sugar, lactose, in milk. In many places of the world, people can't drink milk in light of the fact that their body turns off the intestinal creation of lactase, a chemical that processes the sugar in the milk.
Answer:
They have contributed same allele for straight hair.
Explanation:
There are two conditions homozygous and heterozygous. In homozygous conditions both the allele of a particular gene is same in an offspring which means the offspring got two same alleles from its parent for a particular gene and if an offspring is heterozygous for a gene that suggests that the parent has contributed two different alleles for that gene in the offspring.
So If Micah is homozygous for straight hair then it can be concluded that his parents have contributed two same alleles for straight hair genes.
If Micah is homozygous for the straight hair gene, both of his parents must have contributed an allele for straight hair. They could be homozygous or heterozygous for this trait.
If Micah is homozygous for the gene that determines straight hair, it means he has two of the same type of allele for that gene - in this case, the allele for straight hair. This indicates that both of his parents must have contributed an allele for straight hair. The simplest scenario is that both of his parents are also homozygous for the straight hair allele. However, it's also possible that one or both parents are heterozygous, possessing one straight hair allele and one potentially recessive curly hair allele. In this scenario, they would have each passed the straight hair allele to Micah.
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The answer is; true
These microbes are usually adapted to their environment and this is why they are found in virtually all ecosystems. You will find bacteria even at the bottom of deep ocean beds deep and in geothermal vents, hypersaline water and very cold regions (such as polar regions). Fungi which vary widely in size from microscopically small to the largest organisms such as mushrooms are also found in virtually all environments on earth. They are nonetheless different species of these groups adapted to their environments.
b. The nose
c. The pharynx
Answer:
The correct answer is A. The larynx moves up against epiglottis when food is swallowed to prevent passage of food into it.
Explanation:
The epiglottis is a moist, cartilaginous structure that is part of the cartilaginous skeleton of the larynx. It also marks the boundary between the oropharynx and the laryngopharynx. The epiglottis obstructs the passage of the bolus at the time of swallowing preventing it from going to the respiratory system.
Larynx closure occurs when the vestibular and vocal folds approach the midline during swallowing. Occasionally, when you eat very fast, solid foods or liquids can enter the larynx.
Answer:
No, since different genes will exert varying degrees of influence on the trait
Explanation:
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 phenotypeand genotype. When they interact, they create a gradation in phenotypes, according to the level of contribution.
Let us see, for instance, the eye color trait, which results from the interaction of many genes. Two of them significantly contribute to the color green, blue, or brown, while the rest of the involved genes play a role in defining the spectrum of phenotypes of each eye color. So, there are different tones of blue eyes, green eyes, and brown eyes, and the differences are determined by the contribution of each allele to the phenotype.
In polygenic inheritance, multiple genes influence a trait, and theycan have varying degrees of influence rather than having the exact same effect.
In polygenic inheritance, it is not accurate to say that all genes controlling a trait will have exactly the same influence over the trait. Polygenic inheritance involves multiple genes that work together to influence a trait. This means that these genes do not necessarily exert the same degree of influence; rather, they can and often do exert varying degrees of influence on the expression of a trait. For example, in human skin color, a characteristic feature of polygenic inheritance, several genes, each with different levels of influence, contribute to the trait's expression.
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The terrestrial planets represent characteristics of the four planets that are closest to the sun. Therefore, the correct option is A.
The solar system contains 4 planets that are closest to the sun. These planets are Mercury, Venus, Earth, and Mars. These planets are called terrestrial planets. Like Earth, these planets are rocky and have the same composition and structure. Hence, they are also called telluric planets.
Typically, these planets have a metallic core made primarily of iron and a silicate mantle. On their surface, they have topological characteristics like mountains, valleys, craters, etc.
Terrestrial planets have a secondary atmosphere, as opposed to large planets, which have a main atmosphere. It is well known that terrestrial planets have few or no satellites of their own. For instance, the Earth has just one satellite, but Mars has two, and Venus and Mercury both have none. Therefore, the correct option is A.
Learn more about terrestrial planets, here:
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The question is incomplete, but most probably the complete question is,
Which of the following represents characteristics of the four planets closest to the sun?
1. Terrestrial planets
2. Giant planets
3. Dwarf planets
4. Gas planets
Answer:
they are hot or can get hot
(B) protect coastlines from erosion.
(C) are found in shallow, nutrient poor, tropical waters.
(D) are the most diverse of all marine environments.
(E) All of these choices are correct
Answer:
(E) All of these choices are correct
Explanation:
Coral reefs are some of the most diverse ecosystems in the world. It is produced by Coral polyps and may occur as barrier, fringing, or atoll formations.
Coral reefs protect coastlines from storms and erosion, it is a rich source of job for local communities, and provides avenues for recreation. It is rich in food nutrients and can be used medicinally too.
It exhibits mutualism with photosynthetic algae called zooxanthellae. It supplies shelter and safety and materials needed by zooxanthellae for photosynthesis while it obtains nutrients and oxygen and waste removal mechanism from it.