Press "Enter" to skip to content

How has the peppered moth evolved?

How has the peppered moth evolved?

The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth population as a consequence of air pollution during the Industrial Revolution. The frequency of dark-coloured moths increased at that time, an example of industrial melanism.

What were Kettlewell’s predictions?

Kettlewell thought that if natural selection caused the change in the moth population, the following must be true: Heavily polluted forests will have mostly dark peppered moths. Clean forests will have mostly light peppered moths. Dark moths resting on light trees are more likely than light moths to be eaten by birds.

What would happen if there were no predators in the forest?

What would happen if there were no predators in the forest? No they would not change because they already had the genetics to change and they would have no need for camouflage from predators and no need to be darker or light.

Which is the best prediction of what might happen to the moth population over time?

Which is the BEST prediction of what might happen to the moth population over time? The shades will have little or no effect on the moth population. The lighter-shaded moths will be selected out of the population. The darker-shaded moths will be selected out of the population.

What is the most likely explanation for the increase in the number of Tuskless elephants?

What is the most likely explanation for the increase in the number of tuskless elephants? Scientists theorize that the ancient animal on the left is related to the modern animal on the right and has gone through many changes over time.

How did humans make cow breeds that survived well in cold weather?

Selected cow breeds that did well in cold weather, mated them, and selected the offspring with the improved cold tolerance. How did humans make cow breeds that survived well in cold weather? Humans developed dog mating programs that selected for certain traits.

Which explains how new dog breeds come into existence?

The very first domestic dogs arose from wolf-like ancestors. Which explains how new dog breeds come into existence? Humans developed dog mating programs that selected for certain traits.

Are cows artificially selected?

Not only are most traits sex limited, but herd sizes were traditionally small, the reproductive rate of cows is low and the generation interval is long. Since 1950, artificial insemination (AI), combined with the use of frozen semen, has allowed bulls to be used in multiple herds and even across the globe.

What are the advantages and disadvantages of artificial insemination?

7 Pros and Cons of Artificial Insemination

  • It makes breeding easy and is cost-effective.
  • It allows for genetic preservation.
  • It presents the capability to freeze sperm.
  • It makes remote mating possible.
  • It disturbs species and disrupts their natural habits.
  • It is not effective in other species.
  • It requires the use of anesthetics.

How successful is artificial insemination in cattle?

You do have the option of breeding cows by artificial insemination (AI). It’s not perfect, and maybe you’ll only get 60% to 70% conception with AI. And you’ll still need a cleanup bull to catch late breeders that don’t settle by AI.

Why are cows artificially inseminated?

Today’s farmers know that artificial insemination reduces the spread of disease among herds, reduces the cost and danger of keeping a bull on the farm and avoids injury to cows during mating.

What is the most common reason for culling dairy cattle?

Infertility (32.6% of all culls) was the most prevalent reason of culling followed by mastitis (6.5%).

Are cows artificially inseminated in India?

As per government of India figures, artificial insemination was done in 2,00,748 cows in the last four months from September 15 till Thursday. Telangana leads the country with 2,49,819 AIs during the same period. States such as Uttar Pradesh are far behind with only 1,44,039 AIs in the last four months.