Sentences with phrase «females in their mating»

Tamra Mendelson publishes article in «Evolution,» suggesting males pickier than females in mate choice.

Natural selection may have been initiated by females in their mating choices.

Not exact matches

So Oxitec tried a different approach: genetically modifying male mosquitoes, which in turn seek out female mosquitoes and mate with them, resulting in no offspring — and eventually, a size ably smaller mosquito population, if all goes well.

Scientists in Australia use robotic crab claws to explore the attributes female fiddler crabs look for in a mate.

The fact that humans do not have a limited «mating season» tied to the fertility of the female should be a tip off that our species is somewhat unique in this department.

Genesis tells what God intended and it was God created them male and female — man needed a mate and that was a female — The bible used to be very hard to understand but I sought the Lord with all my heart and I read it now and it does not contradict itself — Many prayers have been answered and I believe in Jesus Christ as Lord and Savior — I can not imagine living in this world as it is and not having that anchor that holds me together day after day.

Precise traits differ from species to species, but in some the mating process is actually the prerogative of the female — the strongest females choose the dominant males, and so the law of natural selection operates and the fittest survive.

For example, a few mutations in a critical binding pocket within the gamete receptors (the proteins that allow a male gamete to adhere to a female gamete) of various invertebrate marine organisms (these organisms simply discharge their gametes into the water in a blind shotgun mating strategy) can produce a reproductive isolation event between subpopulations.

Each partner should test his behavior in the marriage in terms of how well he uses opportunities to make his mate feel more adequate, attractive, and lovable as a male or a female.

Attenborough aims to persuade first through the detail and intimacy of his account of insect life: the female bumble bee's patient construction of the chamber in which she lays her eggs; the cooperative relationship between African acacias and the ants that make «mansions» in the «bloated and hollow» bases of the tree's protective spines (and sting the muzzles of grazing predators, driving them away); the cunning design of the mole cricket's burrow, which amplifies the male's mating song so that, «on a windless night, he can be heard from nearly half a mile away.»

Do you get mad at a dog for barking at a car or mating with a female dog in heat?

Or consider the great uproar over Susan Patton's open letter to female Princeton undergraduates warning them that they'd be wise to land a good man while in college, because our culture has otherwise made such a hash of the mating game.

Studies have found that female mate selection is affected by their menstrual cycles, so to be fair my comment about men also applies to women, although in a slightly altered form.

Breasts have a powerful sexual attraction to them, biologically men are drawn to find female breasts attractive in looking for a mate.

Fertility tests of the mice in adulthood showed that those whose mothers had been fed a high - fat diet while breastfeeding had decreased litter size, longer duration from mating to date of birth and impaired pregnancy rate in both female and male mice.

The election is historic for many reasons: the first African - American candidate (Barack Obama), the oldest man to run for a first term in the White House (John McCain), the first female Republican Vice-Presidential candidate (Sarah Palin) and the most boring Democrat Barack Obama could find for a running mate (Joe Biden).

What may turn out to be most offensive to female voters in this race is the fact that last month Mr. Cuomo's running mate cravenly announced the creation of a brand new Women's Equality Party, which would be endorsing the governor.

«I want to congratulate Kathy Hochul on coming one step closer to becoming New York's first female Democratic Lieutenant Governor in 35 years,» Cuomo said in a statement congratulating his running mate.

This could be intensified if Astorino were to tap a female running mate like Assemblywoman Nicole Malliotakis, a Staten Island Republican whose name has been floated in recent weeks.

Cuomo, who tapped former Buffalo congresswoman Kathy Hochul as his running mate, created the Women's Equality Party in an effort to appeal to female voters.

It comes covered in a hard shell that takes three days to digest, during which time the female can not mate again, says University of Cincinnati biologist Nathan Morehouse.

«What we didn't know and found through our research is that these three structures are distinctly different in protein composition, are separately stored in the male reproductive tract and are transferred sequentially to the female reproductive tract during mating.»

The rest of the complex goody bag of proteins, carbohydrates, lipids and other compounds play all sorts of other important roles in reproduction — not the least of which is a way for the males to prevent the female from mating again for about three to four days, says Morehouse.

In their world, males and females mate and then go on about their business.

And frequent hooters may take advantage of a phenomenon called mate - choice copying, in which females prefer popular males.

Females of most species invest more energy in caring for babies, so they are more picky about when and with whom they mate.

My lab mate turns casually to my female summer student and says, «Hey, you're in college.

In species where females only mate with a single male, the seminal fluid doesn't assault alien sperm.

Read previous Zoologger columns: Slime killer hagfish feasts in rotten flesh, Female monkeys indulge in synchronised sex, The toad that's part clone, part love child, The first reptile with a true placenta, The fearsome jaws of a mini movie monster, Stealth millipede wears living camouflage, Dozy hamsters reverse the ageing process, World's nicest bird murders chicks, Architect mouse builds a food mansion, The amphibious fish that mates with itself, The world's smartest insect, The most athletic ape in the canopy.

The study, led by Dr Allan Debelle and Dr Rhonda Snook in the University's Department of Animal and Plant Sciences, looked at the mating patterns of fruit flies after they evolved for 100 generations in either polyandrous populations (where several males have to compete for a single female) and monogamous populations (where each male has access to only one female).

At Gerall's suggestion, Sonntag made his first foray into research on aging: He gave testosterone to 3 - day - old female rats and discovered that it speeds up the normal, age - related decline in their fertility and interest in mating.

Dominant male chacma baboons allow lower - ranking males to mate with their females as a way to protect the dominant male's own offspring in their absence.

Researchers report that males who evolved in polyandrous populations, where sexual competition was fierce, are much more likely to outcompete the other males and successfully mate, regardless of the population the female comes from.

BY EVOLVING a «shield» for their genitals, female red - backed water striders from east Asia can call the shots in the mating game.

Interestingly, in this study, the scientists also observed that monogamous female fruit flies seem more reluctant to mate with polyandrous male fruit flies — but yet in 80 per cent of the cases this didn't matter because polyandrous males outcompeted monogamous males.

When he then mates with a female bee — a real one this time — they jump ship to her, hang out in her nest and steal the pollen she gathers for her young.

Even if the sex ratio at birth were to normalize tomorrow, Catherine Tucker and Jennifer Van Hook, demographers with Pennsylvania State University's Population Research Institute, recently calculated that fully 10 percent of working - age men in China would still lack a female counterpart in 2050 — and that's assuming that men start marrying women their own age, a change from their current practice of seeking mates a few years younger.

Studies of animals such as rats, guinea pigs, sheep, cats, ferrets and primates have shown that this so - called lordotic posture, in which the lower spine is curved towards the belly, can signal the readiness of females to mate.

In populations where females could choose their mate, males displayed more power and endurance when producing their love song than their counterparts that had evolved under enforced monogamy.

If the female decides that the male is a suitable candidate for mating after listening to his singing, she will spawn in his nest.

In some bird species, like manakins, females do all the parental care, so they can mate with whichever males they prefer.

As a result, those features that females use in order to choose their mates evolve very rapidly.

But such tricks may harm the female's interest, says biologist Andrew Clark of Pennsylvania State University in University Park; cranking up egg production may reduce her life - span and staying single could prevent her from choosing the most interesting mates.

Under these conditions, the males» display behaviors, songs and plumages are important in female mate choice.

Dr Allan Debelle, who conducted the study as part of his PhD under the supervision of Dr Rhonda Snook at the University of Sheffield, said these results suggest that mate choice can be an important driver of the evolution of motor performance, «Our research shows that when, at each generation, females are given a choice among several mates performing energetically costly courtship, the motor performance of males in that population can respond to this selection process and progressively improve.»

During the males» initial encounters with male or female visitors, researchers observed little mating or fighting, and the same neurons lit up in response to both sexes.

Patterns of parental care and productivity of different combinations of male - female pairs from the same or different selection lines were then examined to see whether selection on mating behavior led to a correlated, co-evolutionary response in parental care behavior.

Bigger is better for a female bowerbird in search of a mate, and males are prepared to manipulate perspective to convince them.

Male parental care behavior did not change in response to selection on mating rate, but females responded to selection for high mating rates with a reduction in parental care.

Initially, scientists used fresh semen to artificially inseminate females who failed to naturally mate with males, resulting in 135 kits.