QUIZ 111 - 20/4 (solution)
QUIZ 111 - 20/4 (solution)
SS:nn, Ss:nn is the genotype of?
Scale Carp
Mirror Carp
Leather Carp
Linear Carp
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| source - BdFISH |
genotype for Scale Carp is represented by two pairs of alleles, where "S" represents the dominant allele for scale formation and "s" represents the recessive allele for no scale formation, and "n" represents the homozygous recessive allele for normal fin development.
Therefore, the genotype for Scale Carp can be represented as:
SS:nn - Homozygous dominant for scale formation and homozygous recessive for normal fin development
Ss:nn - Heterozygous for scale formation and homozygous recessive for normal fin development
It's worth noting that this is just one possible genotype representation for Scale Carp, and there may be other variations depending on the specific traits and alleles being considered.
- SSnn, Ssnn - scaled or wild carp
- ssnn - “scattered” mirror
- SSNn, SsNn - linear mirror
- ssNn - “nude” or “leather”
- SSNN, SsNN and ssNN are non viable (lethal genes)
NEU (Nitroso ethyl Urea) is a
Physical Mutant
Chemical Mutant
Physical Mutagen
Chemical Mutagen
NEU, or Nitroso ethyl urea, is a chemical compound that belongs to the group of N-nitroso compounds. It is a mutagenic agent that is commonly used in laboratory experiments to induce mutations in DNA, and it is also used in the agriculture industry as a pesticide and in the pharmaceutical industry as a precursor for the synthesis of other compounds.
NEU works by reacting with the DNA molecule, causing changes in its structure and ultimately leading to genetic mutations. These mutations can have various effects on the organism, ranging from no apparent change to serious health issues or even death, depending on the severity and location of the mutation.
Due to its mutagenic properties, NEU is considered to be a potential carcinogen and is regulated by many government agencies around the world. It should be handled with caution and proper protective measures to prevent exposure to humans and the environment.
1 CM (Centimorgan) is equals to?
1% Crossing over
2% Crossing over
3% Crossing over
4% Crossing over
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| source - wikipedia |
One centimorgan (CM) represents a genetic distance between two loci on a chromosome that has a 1% chance of being separated by recombination in a single generation.
The actual physical distance represented by one centimorgan can vary between different regions of the genome and among different species. In humans, one centimorgan is roughly equivalent to 1 million base pairs (bp) of DNA, although this can vary depending on the specific region of the genome.
It's worth noting that centimorgans are a relative unit of genetic distance and do not correspond directly to physical distance. Instead, they are based on the frequency of recombination events between two loci during meiosis. As a result, the number of centimorgans between two loci can change depending on the genetic background and environmental conditions of the organism being studied.
GIFT Tilapia shows…….. of higher growth than the normal bred tilapia?
30%
40%
50%
60%
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| source - reseachgate |
GIFT Tilapia, which stands for Genetically Improved Farmed Tilapia, is a strain of tilapia that has been selectively bred for fast growth and high yield. Compared to normal bred tilapia, GIFT Tilapia has been shown to exhibit growth rates that are 30-40% higher, depending on the specific environmental conditions and management practices used in farming. Therefore, the correct answer would be either 30% or 40%.
GIFT Tilapia was developed through a breeding program conducted by the WorldFish Center in Malaysia, which aimed to improve the productivity and profitability of tilapia farming in developing countries.
The breeding program involved selecting the fastest-growing tilapia individuals from diverse genetic backgrounds and crossbreeding them over several generations to produce a highly productive strain with desirable traits such as disease resistance, tolerance to poor water quality, and high feed conversion efficiency. The resulting GIFT Tilapia strain has been widely adopted in aquaculture systems around the world and is credited with significantly increasing the global production of tilapia as a food source.
Which of the following fish is banned in India?
Discus
Guppy
Piranha
Oscar
.jpg) |
| source - wikipedia |
Piranha is the fish that is banned in India. Possession, breeding, transport, and sale of piranha fish are prohibited in India under the Wild Life Protection Act of 1972. This is because piranhas are considered a highly invasive species that could pose a threat to the native aquatic ecosystems and biodiversity in India. The other fish species mentioned in the question (Discus, Guppy, and Oscar) are not banned in India and are commonly available in the aquarium trade.
Tilapia is a?
Egg depositor
Egg Scatterers
Egg burrier
Mouth brooder
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| source - twitter |
Tilapia is a diverse group of fish species, but many of them are mouth brooders. Mouth brooding is a behavior where the female fish holds fertilized eggs or newly hatched fry in her mouth for protection and care. The female tilapia will carry the eggs or fry in her mouth until they are large enough to fend for themselves.
While some tilapia species may be egg depositors, egg scatterers, or egg buriers, mouth brooding is a common and notable reproductive behavior observed in many species of tilapia.
Which is the most traded ornamental fish?
Gold fish
Guppy
Neon Tetra
Angel fish
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| source - wikipedia |
The most traded ornamental fish is the Guppy, also known as the millionfish or rainbow fish. The Guppy is a small, colorful freshwater fish that is native to South America but has been widely introduced and is now found in many parts of the world. Guppies are known for their bright colors, energetic behavior, and ease of care, which make them popular choices for aquarium hobbyists and pet stores. They also have a relatively short lifespan, which means that they need to be replaced frequently, contributing to their high demand in the ornamental fish trade.
Guppies are native to South America but have been widely introduced and can now be found in many parts of the world. They are known for their peaceful nature and are often kept in community aquariums with other small fish species. Guppies are livebearers, which means that they give birth to live young instead of laying eggs. They have a relatively short lifespan of around 2-3 years and are prolific breeders, making them easy to maintain and propagate in captivity.
Intestinal breeding occurs in the …………. family?
Serranidae
Gobidae
Cotidae
Cobitidae
Intestinal breeding, or intestinal incubation, occurs in the family of fish called Cobitidae.
Cobitidae, also known as loaches, are a family of freshwater fish that are found in Europe and Asia. Many species in this family exhibit unique reproductive behaviors, including intestinal breeding. In this process, the female loach swallows her fertilized eggs, which then develop and hatch inside her intestine. The female will then expel the fully-formed fry through her anus, where they are immediately able to swim and fend for themselves. This method of reproduction is thought to provide a high level of protection for the developing embryos and ensure the survival of the offspring in the challenging freshwater environments where loaches are found.
There are …………………….zoeal stages in mudcrab
One
Three
Five
Ten
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| source - Icar ecoursesonline |
Mud crabs have five zoeal stages during their larval development. Zoea is the larval stage of many crustaceans, including crabs, shrimp, and lobsters, and it is characterized by the presence of a spiny carapace and several pairs of appendages.
During the five zoeal stages, mud crabs undergo significant changes in morphology and behavior. They gradually develop more pronounced features, such as claws and swimming legs, and they become more active and mobile. After the fifth zoeal stage, mud crabs enter the megalopa stage, which is the final larval stage before metamorphosing into juvenile crabs.
Ovaprim contains ……….. of gonadotropin releasing hormone along with 10 mg of domperidone per ml.
10 mg
20 mg
10 µg
20 µg
Ovaprim contains 20 µg of gonadotropin-releasing hormone (GnRH) along with 10 mg of domperidone per ml. GnRH is a hormone that stimulates the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the pituitary gland, which in turn triggers ovulation and sperm production in fish. Domperidone is a dopamine antagonist that is added to Ovaprim to enhance the effectiveness of GnRH by preventing its degradation and extending its half-life in the body.
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