Generate Quiz 6A7AA7BD68EBE

The forelegs of a horse and the wings of a bird are excellent examples of homologous structures. Since both horses and birds are animals, they have a common ancestor. Despite having quite different external appearances, the internal bone structure of a horse’s foreleg and a bird’s wing is similar.

The internal urethral orifice is constrained by the internal urethral sphincter, a urethral sphincter muscle. It is situated where the urethra and bladder meet, and while it is continuous with the detrusor muscle, it is completely separate from it both anatomically and functionally.

B is the right choice because true-breeding or pure-breeding plants or animals are those that self-fertilize over many generations, maintaining the characteristics under consideration. It is one that yields children with the same characteristics when self-pollinated. When parents breed to produce children with the same phenotype, this is known as true breeding. This indicates that each trait is homozygous in the parents. Because self-fertilization occurs when the male and female gametes of the same individual unite, option b is incorrect. The combination of male and female gametes from distinct individuals within the same species is known as cross fertilization. Genetic diversity is decreased by self-fertilization. Genetic diversity is increased through cross-fertilization.

The parental phenotypes are Bb [heterozygous] *bb [homozygous], and the allele for the blue phenotype [dominant] = B and the allele for the white phenotype [recessive] = b. White phenotypic probability = [1+1]/4=0.5 = 50%

A sterile male drosophila is produced by XO. Since XO indicates that the second chromosome is absent. The female has two X chromosomes, whereas the male has only one X and one Y chromosome. Therefore, a normal female is produced when drosophila offspring carry one X chromosome from a male and one from a female, whereas a sterile male is produced when offspring carry one X chromosome from a female and no chromosome from a male.

Option A is the right one. Linnaeus believed in special creation, which holds that God created all living things in their current state.

The adaptation of an organism or cell to carry out particular tasks or functions within a larger system and to occupy a niche is referred to as specialization. Specialization is the right choice because it enables organisms to effectively perform specific tasks that support the general survival and prosperity of their species or community. If conditions drastically change or their niche is disrupted, specialized species may find it difficult to adapt. As a result, ecosystem resilience and health are enhanced by a balance between generalist and specialist species.

Convergent evolution produced analogous organs. Even in species that are not closely related in terms of evolutionary history, analogous organs provide an intriguing illustration of how natural selection can mold organisms to adapt to similar environments, resulting in similar solutions to environmental challenges.

“Convergent evolution” refers to the independent evolution of similar traits by various organisms. The opposite is known as “divergent evolution,” in which related species develop distinct traits. Convergent evolution produced “analogous structures,” which differ anatomically but serve comparable purposes.

The result of crossing both parents is an F1 generation with heterozygous purple flowers. The following ratio is obtained when F1 and F2 are crossed. White-flowered and purple-flowered 3:1 Therefore, white flowers will be present on ¼ of the plants. The right choice is option A.

In a criminal investigation, a laboratory technique called DNA fingerprinting is used to connect biological evidence to a suspect. A suspect’s DNA sample and a sample collected from a crime scene are compared. Paternity can also be established through DNA fingerprinting. A DNA fingerprint is depicted in the figure below:

The impact of purifying selection can be summed up as follows: “It removes variation from the population.”

Natural selection that works to remove harmful or detrimental alleles from a population is called purifying selection, sometimes referred to as negative or stabilizing selection. Over time, it reduces genetic diversity within the population by favoring the removal of harmful alleles and the preservation of beneficial ones. Purifying selection essentially works to “purify” the gene pool by eliminating undesirable genetic variants while preserving or boosting the frequency of advantageous ones.

The flagella may have developed as a result of ingesting spiral-shaped bacteria called spirochetes. Because of their flagella, spirochetes are able to move around, which is known as motility. Paramecium, Chlamydomonas, and Cyanobacteria are all eukaryotes, or nucleated organisms. Prokaryotes did not give rise to eukaryotes.

It’s just picking the odd one out in this question. Defects in the heart are not inherited. Genetic defects such as those listed in other options can be detected by amniocentesis.

Only one allele from the genotype manifests as the phenotype in complete dominance. Codominance occurs when the phenotype exhibits both of the genotype’s alleles. A combination of the genotype’s alleles manifests as the phenotype in incomplete dominance.

Since the phenotype is the same in both homozygous and heterozygous forms of the dominant allele, the genotype cannot be determined.

The right response is d) Coccyx. While teeth, body hair, and nails are not vestigial and serve vital purposes in the human body, the coccyx is a vestigial structure. Structures that have lost their original purpose due to evolution are known as vestigial organs.

An organism with a homozygous recessive phenotype and another with a dominant phenotype but an unknown genotype is called a test cross. Finding the genotype of the organism exhibiting the dominant phenotype is the aim of a test cross. The organism with the dominant phenotype must be heterozygous for the trait in question if any of its progeny exhibit the recessive phenotype. Depending on the trait under study, test crosses can be used for either monohybrid or dihybrid crosses.

The polymerase chain reaction (PCR) uses Taq polymerase, a heat-stable DNA polymerase, to amplify DNA. Thermus aquaticus, a bacterium that lives in hot springs and other hot environments, is where it was first isolated. Taq polymerase is a useful tool for molecular biology because it can tolerate the high temperatures needed for the denaturation of double-stranded DNA during PCR.

Due to its dominance, the trait for red flowers (R) can manifest in both homozygous (RR) and heterozygous (Rr) conditions, both of which will produce red flowers.

Answer D is accurate since a homozygous state of a recessive trait must manifest as a phenotype.

The DNA synthesis enzyme taq polymerase is most active between 70 and 80 degrees Celsius, though it can also work close to 100 degrees.

One theory that explains the genetics underlying evolution is called neo-Darwinism. The origin of life on Earth is attempted to be explained by the theory of special creation. Among the theories of evolution is Lamarckism.

An example of epistasis is the Bombay phenotype. The H antigen is absent in people with this phenotype, making it the rarest blood group in the ABO blood group system (genotype hh). In 1952, it was initially found in Bombay.

The final generation’s 1:1 ratio is described by the following phenomenon: In terms of genetics, codominance describes a form of inheritance where two distinct expression patterns (alleles) of the same gene result in distinct traits in an individual.

DNA recombinant technology depends on enzymes, which aid in the necessary modification and alteration of DNA molecules.

According to Mendel’s law of independent assortment, the alleles of two or more distinct genes are sorted into gametes separately.

Option A: Mendel wrote articles about inheritance. Choice: B Wallace forwarded his hypothesis to Darwin. Wallace was aware that Darwin was conducting related studies. He wrote Darwin a letter in 1858 explaining his views on evolution. The two worked together to discuss their evidence for evolution and natural selection in a scientific paper. Option C: Lamarck released his evolutionary theory. Option D: Margulis’ theory of symbiogenesis, which contradicts the core ideas of neo-Darwinism, is what made her most famous.