Animalscaretips
- Is there a relationship between the size of offspring and the number of offspring produced?
- What determines which offspring will survive?
- Does reproduction affect lifespan?
- Why do larger animals have fewer offspring?
- How do the two processes of reproduction and growth influence the life history patterns of some organisms?
- Why do some animals have more babies than others?
- What is reproductive lifespan?
- Why do humans live past their reproductive age?
- Can a human reproduce life long?
- Why is it important that more offspring are born than can survive?
- When more offspring are produced than can survive?
- Why can only a limited number of offspring can survive in a fish population?
- Do larger or smaller offspring tend to have higher fitness and survival?
- What happens when species produce too many offspring?
- Why do mammals produce fewer offspring than amphibians?
Is there a relationship between the size of offspring and the number of offspring produced?
The probability of offspring to reproduce in time can be increased with a larger investment per offspring, which inevitably decreases offspring number [1]. ... A negative genetic correlation between offspring number and size has been reported in oviparous vertebrates (fish [7, 8], reptiles [9, 10] and birds [11]).
What determines which offspring will survive?
Species produce more offspring than can survive. Offspring with favorable variations are more likely to survive and reproduce. Gradually, individuals with favorable variations make up more of the population.
Does reproduction affect lifespan?
Reproduction generally reduces survival, more reproduction shortening life span, less reproduction increasing life span. This effect is not absolutely universal, but it is one of the better established patterns in the biology of aging.
Why do larger animals have fewer offspring?
Tiny Litters
The presence or absence of predators is an important factor influencing the size of offspring and litters. In general, when comparing closely related snakes, the one with fewer natural predators often produces litters of fewer, larger young than those from predator-rich environments.
How do the two processes of reproduction and growth influence the life history patterns of some organisms?
Life history patterns evolve by natural selection, and they represent an "optimization" of tradeoffs between growth, survival, and reproduction. ... Early reproduction lowers the chance of dying without offspring, but later reproduction may allow organisms to have more or healthier offspring or to provide better care.
Why do some animals have more babies than others?
In fact, all animals produce more offspring than can survive long enough to reproduce themselves. This increases the likelihood that at least one offspring will survive to adulthood to carry on the genetics of the parent. The number of offspring produced is often related to the amount of parental care.
What is reproductive lifespan?
Reproductive lifespan was defined as the difference between ages at menopause (natural or surgical) and menarche and categorized into quartiles (<33, 33-37, 38-40, or >40 years). Parity was defined as the number of term pregnancies. Information on past oral contraceptive (OC) use was also collected.
Why do humans live past their reproductive age?
Human ovaries tend to shut down by age 50 or even younger, yet women commonly live on healthily for decades. This flies in the face of evolutionary theory that losing fertility should be the end of the line, because once breeding stops, evolution can no longer select for genes that promote survival.
Can a human reproduce life long?
Neither of these hypotheses, however, can explain why long-lived females cease reproduction. ... Humans' exceptionally long lifespan following reproductive cessation has been suggested to be an artefact of modern medicine and the benign living conditions of the contemporary world 44, 45, 88.
Why is it important that more offspring are born than can survive?
Organisms produce more offspring than actually survive. ... One reason that not all organisms survive is that there are not enough resources, things that they need, to go around. Organisms must struggle to get what they need to survive, competing against other organisms that want the same things they do.
When more offspring are produced than can survive?
Natural selection is an inevitable outcome of three principles: most characteristics are inherited, more offspring are produced than are able to survive, and offspring with more favorable characteristics will survive and have more offspring than those individuals with less favorable traits.
Why can only a limited number of offspring can survive in a fish population?
In a fish species, the number of eggs that hatch and survive for one year varies depending on the number of eggs that were produced. As the number of eggs produced increases past a threshold number, the survival rate of the offspring decreases.
Do larger or smaller offspring tend to have higher fitness and survival?
There are several viable explanations for why larger offspring often perform better than smaller offspring. A general consensus is that bigger offspring tend to have more mass and so it is often inferred that larger offspring have more energy to devote to fitness-enhancing processes such as growth [12].
What happens when species produce too many offspring?
When more offspring are produced, it increases the odds of a spontaneous variation. ... A variation could be a genetic advantage, such as a bird with brighter colors who is able to attract more and better mates. Over time, multiple variations could lead to the creation of a new species altogether.
Why do mammals produce fewer offspring than amphibians?
Mammals tend to care for their young (Hence the mammary glands, pouches, etc…), and count upon a larger percentage, of a smaller number, surviving. If the litter is too large, etc…a mammal could not nurse them all, so, the limiting factor is the available milk.
