Describe how an organism has 2 sets of dna and the importance of homologous chromosomes

Answer: D.) The population of aquatic plants in Location B will decrease because water is contaminated.

Explanation:

The population of aquatic plants in Location B will decrease because

water is contaminated.

This involves the presence of impurities and unpleasant elements in an

area.

The excessive use of pesticides and fertilizers in areas will result in it

seeping inton the ground and into water bodies. The animals present in

the water body will die as a result of the  harmful chemicals which is

present.

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Answer:

Hi,

The correct answers should be:

Electrons are smaller than protons

The majority of an atom’s mass is in the nucleus

Protons and neutrons are about the same size.

The first option is not true since in the picture you can see three different kinds of particles, while the second one is false since different electrons can occupy different energy levels and the same electron can “jump” from one energy level to another one if stimulated.

Hope this helps! If my answer was not clear enough or you’d like further explanation, please let me know.

Explanation:

The answer is earthquake.

Answer:

avalanche

Explanation:

i took a test and the correct answer is avalanche

Answer:

The correct answer is cerebellum. This part of your brain controls balance.

Explanation:

Odyssey

The mouse parent probably had a genetic makeup of Bb meaning that there is a gene of the white hair within their own genes of a dominate black hair. Since the white hair mouse had a complete recessive gene makeup of white hair and black hair is dominate in this situation the only genetic makeup that would work would have to be dominate recessive for the dominate gene is the one that shows but that mouse parent cannot be completely dominate or there would be no white haired offspring

If Mendel crossed two pea plants and obtained both tall and short offspring, then it is possible that the parent plants were both heterozygous for the gene that controls the height.

When these alleles combine in the offspring, there is a 25% chance of getting a homozygous dominant (TT) plant (which would be tall), a 50% chance of getting a heterozygous (Tt) plant (which would also be tall), and a 25% chance of getting a homozygous recessive (tt) plant.

Therefore, it is possible that the parent plants were both heterozygous (Tt) for the height gene, which would result in both tall and short offspring.

The phenotype that could not have been present would be a plant with an intermediate height between tall and short, as this is not how the height gene is inherited in pea plants.

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The parent pea plants Mendel crossed to produce both tall and short offspring were likely heterozygous tall (Tt x Tt). Medium-sized plants could not have been present because pea plant height does not exhibit incomplete dominance. A Punnett square for this cross would show a genotypic ratio of 1:2:1 and a phenotypic ratio of 3 tall: 1 short.

If Mendel crossed two pea plants and got both tall and short offspring, the genotypes of the parent plants could have both been heterozygous for the tall trait (Tt). A heterozygous organism has one dominant and one recessive allele for a trait, so when crossed with another heterozygous organism, they can produce offspring with a mix of phenotypes. Tallness is a dominant trait in pea plants, while shortness is recessive.

The phenotype that could not have been present in the offspring of two heterozygous tall plants is medium-sized plants. This is because height in pea plants does not exhibit incomplete dominance, where a blend of traits might be present, but follows Mendel's principle of dominance. Hence, the tall trait (T) being dominant would mask the expression of the short trait (t) in a heterozygous organism (Tt), resulting only in tall plants. A short offspring could only appear if it were homozygous recessive (tt), receiving a recessive allele (t) from both parents.

Using a Punnett square to predict the offspring of a cross between two heterozygous tall pea plants (Tt x Tt), the genotypic ratio would be 1 TT : 2 Tt : 1 tt, which corresponds to a phenotypic ratio of 3 tall : 1 short. This is because the chance of an offspring receiving two dominant alleles (TT), one of each (Tt), or two recessive alleles (tt) varies, with TT and Tt resulting in the tall phenotype and only tt resulting in the short phenotype.

Codominance is a condition where both alleles are fully and separately expressed in a heterozygous genotype. An example is the blood types in humans, where IA and IB alleles are codominant, resulting in the AB blood type.

When both alleles are fully and separately expressed in a heterozygous genotype, this is called codominance. In codominance, both alleles affect the phenotype in separate and distinguishable ways. For example, in the case of blood type, a person can have the genotype IAIB, which represents type AB blood. Here, both IA and IB alleles are codominant, resulting in a phenotype (blood type) where both alleles are expressed. This is different from incomplete dominance, where the phenotype of the heterozygous genotype is an intermediate expression of two alleles.

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Answer:

0%

Explanation:

The cross of a pea plant with round seeds (RR) with another pea plant with wrinkled seeds (rr) is shown as under :

P              RR  x   rr

F1          Rr    Rr    Rr   Rr

It is clear from the cross above, all the 4 probable progenies in filial 1 (F1) generation will be heterozygous with Rr genotype. Not even a single progeny will have homozygous recessive genotype which is responsible for producing wrinkled seeds. Also, even though the genotype of the progenies will be Rr not RR yet phenotypically they all will have round seeds i.e. they will show dominant trait. The reason behind it is that one of the alleles R which is responsible for dominant trait will mask the expression of recessive allele r. So, wrinkled phenotype which is a recessive trait will not be observed in any of the progenies.

An increase in food and a decrease in predators would most likely genetic variation in a population and the growth of the population is slow.

The average number of individuals per unit area in a population is known as population density. For the calculation of population density, the formula is population density which is denoted by D equals the number of people denoted by N divided by area per cubic kilometers denoted by S. Therefore, D= N/A.

The use of the calculation of the population density is for the estimation of the population in a particular area. The factors affecting population density are an increase in the number of predators, food, and water sources, a decrease in the living area, and climatic changes.

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Changes in the iguana population's phenotype over generations suggest that natural selection favored the webbed feet trait as an adaptation, leading to its increased frequency in the gene pool.

The change in phenotype of the iguana population from 100% non-webbed feet to a 50% non-webbed: 50% webbed ratio over three generations can be explained by evolution and natural selection. The iguanas with the webbed feet phenotype may have had an adaptive advantage in the relatively dry habitat, which could include better mobility over sandy terrain, leading to increased survival and reproductive success. This adaptation would result in the webbed feet trait becoming more common in the population. The concept of natural selection, as observed by Darwin in the Galápagos, can also be applied here—traits that enhance an organism's fitness in its environment become more prevalent over generations. Additionally, the study of urban lizards in Puerto Rico provides real-world evidence that rapid genetic differentiation and adaptive changes can occur in response to environmental pressures, although the exact environmental factors selecting for webbed feet in this case are not specified.

Answer:

Gene

Explanation:

The gene is a segment of a DNA molecule (deoxyribonucleic acid), responsible for the genetically inherited characteristics. Each gene is made up of a specific DNA sequence that contains a code to produce a protein that performs a specific function in the body. Each human cell has about 25,000 genes.

Most genes are contained in chromosomes. The chromosome is made up of a long chain of DNA wrapped around a special protein called histone. Most chromosomes contain several different genes.

Answer: Fast

Explanation: Fast carbon cycle include the process which can circulate the carbon in the ecosystem in comparatively less time. For example, carbon dioxide is taken up by plants and converted into food, which is consumed by animals. Animals then release carbon dioxide which is again consumed by plants. So this is a repeatedly undergoing cycle. The main process involved behind this is photosynthesis. All the three- plants, algae and phytoplanktons perform photosynthesis, so they are the part of fast carbon cycle.

Answer:

Skull size of each species

Explanation:

The ribosome is a common cell feature between prokaryotes and eukaryotes. So the correct option is B.

The process of making proteins in a cell takes place at an intercellular structure called a ribosome, which is formed of both RNA and protein. The messenger RNA (mRNA) sequence is read by the ribosome, which then converts the genetic code into a specific string of amino acids that develop into extended chains and fold to create proteins.

The biological machinery that produces proteins is known as a ribosome. Each cell has several ribosomes, which are each composed of two subunits. These two subunits form a tight seal around the messenger RNA molecule before moving down its length and reading each three-letter codon.

The transfer RNA, whose base sequence matches that of the messenger RNA, docks to the ribosome. A specific amino acid can be added to the end of the expanding protein chain by pairing each three-letter messenger RNA codon with the corresponding anticodon on a particular transfer RNA. Once the protein is finished, the ribosome fragments.

Therefore the correct option is B.

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In a monohybrid cross, if gene for tall (T) plants was incompletely dominant over the gene for short (t) plants, it will give plants with intermediate tall (Tt) in first filial (F1) generation. When the F1 offspring consisting of all intermediate tall are allowed to cross, the resulting (F2) offspring consist of all three phenotypes [25% tall (TT): 50% intermediate tall (Tt): 25% short (tt)]. The phenotypic ratio is 1:2:1.

The digestive system maintains homeostasis by creating the proper pH balance in the gastric environment. In addition, by maintaining the correct enzyme ratio, the digestive system nurtures beneficial bacteria that inhibit disease and produce biological substances the body needs such as vitamin K.

Homeostasis is the balance the body maintains to continue to function properly. All the bodily systems, including the digestive system, contribute to homeostasis. The body maintains homeostasis using both positive and negative mechanisms. Negative feedback occurs when the body senses an imbalance, and the various systems work to counterbalance and restore proper equilibrium. Positive feedback happens when the body senses a change and works to enhance it.

The digestive, endocrine, and excretory systems play crucial roles in maintaining homeostasis, which is the balanced and stable internal environment required for optimal bodily function.

The digestive system is responsible for breaking down food into nutrients that can be used by the body, and eliminating waste products. It plays a key role in maintaining homeostasis by regulating the absorption and distribution of nutrients, as well as removing waste and toxins from the body.

The endocrine system is responsible for producing and releasing hormones, which act as chemical messengers that regulate various bodily functions.

Hormones are involved in a wide range of processes that help maintain homeostasis, including regulating metabolism, controlling blood sugar levels, and maintaining fluid balance.

The excretory system is responsible for removing waste products from the body, including excess water, salts, and metabolic waste products such as urea.

This system plays a key role in maintaining homeostasis by regulating the concentration of electrolytes and other substances in the body fluids, as well as regulating fluid balance and blood pressure.

Overall, the digestive, endocrine, and excretory systems work together to maintain homeostasis by regulating the intake, processing, and elimination of nutrients and waste products, and by ensuring that hormones and other chemical messengers are released in the right amounts to regulate bodily functions.

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