Answer:
Explanation:
Meiosis is a type of cell division in which the ploidy of the organism reduces to half in the daughter cells.
Meiosis produces 4 daughter cells from 1 parent cell with a different combination of the genetic material but haploid chromosomes.
The meiosis process takes place in two stages in which during the first stage, the homologous chromosomes separate reducing the chromosome number to half that is from diploid chromosomes of parents to haploid in daughter.
Since the process of meiosis form haploid gametes in both male and female therefore after fertilization restores the diploid chromosomes of the parent cell and form a diploid structure.
1. A chromosome contains one long DNA molecule.
DNA or deoxyribonucleic acid is a fundamental and essential macromolecule that is built from the chain of nucleotides. A nucleotide consists of one of four nitrogen-containing nucleobases (cytosine [C], guanine [G], adenine [A] or thymine [T]), a sugar called deoxyribose, and a phosphate group. DNA carries the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms. It is organized (packed) into structures-chromosomes and during cell division, these chromosomes are duplicated in the process of DNA replication. The process of replication provides each cell with its own complete set of chromosomes.
2. Each gene in this molecule gives the instructions for making a PROTEIN.
The genetic information in a genome is held within genes. Genes are a sequence of DNA that codes for a molecule that has a function, and usually, it is a protein. During gene expression, the DNA is first copied into RNA in a process called transcription. Then, synthesized RNA can be directly functional or be the template for a protein that performs a function. Synthesis of protein from RNA is a process called translation.
3. Both chromosomes in a pair of HOMOLOGOUS chromosomes have the same GENE, but the two chromosomes may have different ALLELES.
Homologous chromosomes are a set of one maternal and one paternal chromosome. Those chromosomes pair up with each other inside a cell during meiosis. Homologs have the same genes in the same loci but the alleles may be different, resulting in different phenotypes of the same genes. During the meiosis, the process of crossing over occurs when homologous chromosome pair exchange parts of DNA with one another.
4. Chromosomes that are not homologous have different GENE which gives the instructions for making different kinds of proteins.
Non-homologous chromosomes differently from homologous consist of alleles of different types of genes. Non-homologous chromosomes do not pair during meiosis and the shape of the chromosome, the length of the arms and the position of the centromere, is different among those chromosomes.
ANSWER ASAP
Red blood cells lack a nucleus and have limited organelles, allowing more space for carrying oxygen. They have a unique biconcave shape, short lifespan, and cannot undergo cell division. Their specialization lies in oxygen transport, making them highly efficient in their function.
Red blood cells (RBCs), or erythrocytes, are disk shaped blood cells without a nucleus and most organelles. Their main role is to transport oxygen throughout the body, facilitated by the protein hemoglobin. Hemoglobin binds to oxygen in the lungs and releases it to body tissues.
Due to hemoglobin, RBCs appear red and give blood its color. They have a lifespan of about 120 days and are continually replaced in the bone marrow. RBCs are vital for maintaining proper oxygenation of tissues and supporting metabolic functions.
Their unique structure and function make them essential components of the circulatory system in vertebrates, including humans.
Learn more on redblood cells here brainly.com/question/2994911
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Answer:
It is different because they have no nucleus and can easily change shape.
Explanation:
Most other cells cannot do this.
I hope this helps!!
Answer:
Does vog (volcanic smog) impact plants and animals? | U.S. ...
When vog mixes directly with moisture on the leaves of plants it can cause severe chemical burns, which can damage or kill the plants. Sulfur dioxide (SO2) gas can also diffuse through leaves and dissolve to form acidic conditions within plant tissue.
Explanation:
(B) 10% of the original energy from the Sun
(C) 10% of the plant's energy
(D) 0.9% of the plant's energy
Answer: The correct answer is C) 10% of the plant's energy.
In an ecosystem, there are various trophic levels, which form the part of the food chain. Producer like plants forms the first trophic level as they synthesize their own food via photosynthesis.
The energy from producers is transferred to the primary consumers. It is only 10% of the producer's energy.
This is in accordance with the 10% law of energy transfer. According to this law, only 10% of the energy is transferred from one trophic level to the next trophic level in an ecosystem. This is because the rest of the energy is utilized by the organism or released as heat in the environment.
Thus, option C) is the right answer.
B) plants evolved alternation of generations independently of green algae.
C) alternation of generations cannot be beneficial to charophytes.
D) land plants evolved directly from the green algae that perform alternation of generations.
E) scientists have no evidence to indicate whether or not land plants evolved from any kind of alga.
Recent molecular evidence suggests that land plants evolved directly from the type of green algae that performs alternation of generations. This trait was likely beneficial and thus retained in all land plants.
The correct interpretation of the given observations is D) land plants evolved directly from the green algae that perform alternation of generations. Molecular systematics evidence suggests a close relationship between charophytes (a type of green algae) and land plants, however, charophytes do not exhibit alternation of generations. This implies that the trait arose after the divergence of charophytes and the lineage that led to land plants. Once land plants appeared, all of them possessed the capacity to undergo alternation of generations, suggesting this trait was beneficial and retained in the subsequent evolution.
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Taking into account recent molecular systematics evidence, it is inferred that land plants evolved from the type of green algae that execute alternation of generations.
Based on the given information and considering the latest evidence from molecular systematics, it can be inferred that land plants evolved directly from the green algae that perform alternation of generations. This conclusion is drawn from the fact that both green algae (some species) and all land plants show the alternation of generations, a complex lifecycle involving two distinct multicellular stages. Charophytes, despite being a group of green algae, don’t display this trait, suggesting a different evolutionary pathway.
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