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#animal reproduction

11 public questions tagged with this topic.

Developmental biology Basics

Dolly the sheep later reproduced by which mode?

Dolly, despite originating via somatic cell nuclear transfer, possessed fully functional reproductive system with normal ovaries and estrous cycles. She mated naturally with Welsh Mountain ram named David and produced six lambs: Bonnie in 1998, followed by twins Sally and Rosie, and triplets Lucy, Darcy, and Cotton later. This demonstrated cloned animals could reproduce via conventional sexual reproduction, producing gametes through meiosis, fertilization, and embryonic development. Natural breeding success dispelled concerns cloning caused absolute sterility, though Dolly later developed premature arthritis and shortened telomeres raising questions about cloning associated epigenetic aging.

Ref: Wilmut & Campbell, Nature 1997; Gilbert, 12th ed., Chapter 3: Dolly reproduction.

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amphibian Development-l

Amphibian eggs are classified as:

Amphibian eggs contain moderate amount of yolk unevenly distributed, denser at vegetal pole and sparse at animal pole, a condition classified as mesolecithal or moderately telolecithal. This intermediate yolk content distinguishes them from alecithal mammalian and highly telolecithal avian eggs. Because yolk impedes cytokinesis vegetally, cleavage remains holoblastic but unequal, producing small animal micromeres and large vegetal macromeres. Mesolecithal organization permits blastocoel formation and sets up gradients of maternal mRNAs like VegT, influencing germ layer patterning and gastrulation movements for aquatic development.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 2: Amphibian eggs mesolecithal pattern and yolk distribution.

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TERRITORY BEHAVIOUR

Territorial males may allow females to access resources to:

Gain mating access reflects key principle in quiz on territory behaviour+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Gain mating access aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Gain mating access fits helps integrate natural selection, environment.

Ref: Krebs & Davies, Behavioural Ecology, Chapter 5: Territoriality.

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TERRITORY BEHAVIOUR

Primary function of territoriality in mating is:

Territoriality is occupation and exclusive defense of area against conspecifics to secure resources like food, mates or nesting sites, differing from home range which is undefended. Benefits include exclusive resource access, costs involve time and energy for patrolling and aggression. Optimal territory size maximizes net benefit. Defense via song, scent marking, visual displays and aggression maintains boundaries. This behavior illustrates resource defense theory central to behavioral ecology. Hence Mate attraction defines area defense strategy. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype, phenotype and

Ref: Krebs & Davies, Behavioural Ecology, Chapter 5: Territoriality.

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SPECIATION

Sperm competition occurs when:

Multiple males mate with same female reflects key principle in quiz on mating behavior+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Multiple males mate with same female aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Multiple males mate with same female fits helps integrate natural selection, drift and species concepts essential for NEET, CSIR-NET and GATE examinations. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and

Ref: Alcock, Animal Behavior, 11th ed., Chapter 11: Mating Systems.

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SPECIATION

Polyandry is usually associated with:

Female-biased OSR reflects key principle in quiz on mating behavior+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Female-biased OSR aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Female-biased OSR fits helps integrate natural selection, environment.

Ref: Alcock, Animal Behavior, 11th ed., Chapter 11: Mating Systems.

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SPECIATION

In lek systems, males provide:

Only displays reflects key principle in quiz on mating behavior+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Only displays aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Only displays fits helps integrate natural selection, environment.

Ref: Alcock, Animal Behavior, 11th ed., Chapter 11: Mating Systems.

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