Biology Genetics Evolution

Explanation

Microsatellite DNA, also known as short tandem repeats, are repetitive DNA sequences used in molecular biology to study genetic variations and evolutionary relationships among different species. By analyzing the variations in microsatellite DNA, researchers can determine the relatedness and genetic diversity among various species of fauna, making it a valuable tool for studying evolutionary relationships.

Explanation

Mitochondrial replacement therapy can help prevent the transmission of mitochondrial diseases from mother to child. Since mitochondria are inherited exclusively from the mother, mitochondrial diseases are passed down maternally. Therefore, both statements are correct in the context of hereditary diseases related to mitochondria.

Explanation

In the field of genetic engineering, it is possible to introduce genetic changes in the cells that produce eggs and sperms of a prospective parent, edit a person's genome before birth at the early embryonic stage, and inject human induced pluripotent stem cells into the embryo of a pig. These three possibilities are technically feasible.

Explanation

Recent advancements in science have shown that it is possible to create functional chromosomes by combining DNA segments from cells of different species. Laboratories can also create artificial functional DNA fragments. It is also possible to introduce a DNA segment from one species into the cells of another species. However, it is not accurate to say that DNA segments of species can be directly used to produce new enzymes. DNA segments code for proteins, some of which may function as enzymes, but the DNA segments themselves do not have the capability to create enzymes.

Explanation

The term 'Denisovan' is often discussed in the media and was first identified in 2010. Despite being not yet officially classified, there is evidence of Denisovan genetic material among Aboriginal Australians. This indicates that 'Denisovan' refers to an early human species, making option (b) the correct choice.

Explanation

In a recent development in science, researchers at the University of Texas successfully engineered the first living organism with 'artificial' DNA. This information eliminates option (b) as it is a correct statement. It is also known that DNA replication can be carried out outside a cell, dismissing option (c). Furthermore, cell division of Chlamydomonas, a type of algae, is typically induced in laboratory settings through exposure to alternating light and dark periods, ruling out option (d). Therefore, the incorrect statement among the options provided is (a), where functional chromosomes cannot be created by joining segments of DNA from cells of different species.

Explanation

Honeybees are known to perform a waggle dance to inform their fellow bees about the direction and distance of food sources.

Explanation

According to Chargaff's rule, if the adenine content in a DNA molecule is 15%, then the thymine content will also be 15%. Therefore, the combined content of guanine and cytosine will be the remaining 70% (100% - 30% for adenine and thymine). As guanine pairs with cytosine, the content of cytosine in the DNA molecule will be 35%.

Explanation

Bioinformatics has brought attention to the term 'transcriptome' in recent news. It refers to the full range of mRNA molecules expressed by an organism. The transcriptome encompasses all RNA molecules within a single cell or a group of cells.

Explanation

In bacteria, the process of DNA replication happens before the cell undergoes binary fission, which is the method of cell division in bacteria.

Explanation

In the scenario where a color blind man marries a woman with normal color vision genes, the likelihood of their son being color blind is 0%. This is because color blindness is a recessive trait carried on the X chromosome, which sons do not inherit from their fathers. Therefore, the correct answer is option (a) 0%.

Explanation

Snakes losing their limbs can be understood through the evolutionary concept of use and disuse of organs. According to Lamarck, when a body part is used more frequently, it becomes stronger, while a less used part gradually diminishes over time.

Explanation

In this question, you were asked to match achievements in genetics with the respective scientists who made them. Lederberg discovered transduction, Morgan established sex-linked inheritance, Kornberg isolated DNA polymerase, and Khurana established the complete genetic code. The correct matching of these achievements with the scientists is as follows: A – 3; B – 4; C – 2; D – 1.

Explanation

The unique feature of DNA that allows it to effectively store and transmit genetic information across generations is the complementary nature of its two strands. This means that the base pairs on one strand match up with their complementary bases on the other, ensuring accurate replication and inheritance of genetic material.

Explanation

DNA fingerprinting is a powerful method used to determine paternity and identify criminals in cases of rape and assault. This technique can be applied to trace evidence such as hair, saliva, and dried semen for DNA analysis.

Explanation

In the field of science and technology, the assertion is that Dolly was the initial cloned mammal, while the reason given is that Dolly was created through in vitro fertilization. The correct option is that the assertion is false, but the reason is true. It is worth noting that although Dolly is a well-known cloned animal, she was not the very first cloned mammal. The first cloned mammal was actually a mouse.

Explanation

In the field of biology, different theories and concepts are attributed to various scientists. The theory of mutation was proposed by de Vries, while the theory of evolution is credited to Darwin. The operon concept, on the other hand, was developed by Jacob and Monad.

Explanation

In 1996, the sequencing of the entire genome of an organism was successfully accomplished for the first time. The organism in question was yeast, specifically Saccharomyces cerevisiae.

Explanation

DNA fingerprinting is a technique used to determine the biological relationship between individuals, such as paternity. This technology involves analyzing sample cells from the individuals in question. DNA fingerprinting is a valuable tool in solving cases like rape and murder.

Explanation

Which of the following professionals are most likely to experience a permanent change in their cell's DNA? 1. Researchers using Carbon 14 isotope 2. X-ray technician 3. Coal miner 4. Dyer and painter. The correct answer is (a) 2 alone. X-ray technicians are more likely to be at risk of a permanent change in DNA due to the nature of their work. Researchers using Carbon 14 isotope and dyers/painters may also be at risk. Coal miners, however, are exposed to very low levels of Carbon 14 and are not likely to experience a change in their DNA.