Contents
- 1 What was the researchers main hypothesis?
- 2 Why did dark-colored rock pocket mice first appear in a population of light colored rock pocket mice?
- 3 Can predation result in natural selection?
- 4 Do male guppies in pools with pike cichlid fish have brighter color patterns than females in the pool?
- 5 What makes a good hypothesis?
- 6 What are the 3 types of hypothesis?
- 7 What is the genetic difference between light and dark colored mice?
- 8 What caused the dark variation in the rock pocket mice?
- 9 Why are some mice light colored and some mice dark colored?
- 10 What’s the definition of natural selection?
- 11 Which of the following about natural selection is true?
- 12 Can prediction result in natural selection for color patterns in guppies?
- 13 Why do female guppies prefer brightly colored males?
- 14 Why are male guppies so colorful?
- 15 What factors caused the variation in the colors of the guppies?
What was the researchers main hypothesis?
What was the researchers ‘ main hypothesis? Researchers further hypothesized that if predation pressure is reduced, drab coloration would become less beneficial (since females prefer brightly colored mates).
Why did dark-colored rock pocket mice first appear in a population of light colored rock pocket mice?
Why did dark – colored rock pocket mice first appear in a population of light – colored rock pocket mice? They have a genetic mutation that affects their fur color. -Mutations for advantageous traits are more likely to be passed on to the next generation. -Natural selection acts on traits.
Can predation result in natural selection?
Selective predation can lead to natural selection in prey populations and may alleviate competition among surviving individuals. The processes of selection and competition can have substantial effects on prey population dynamics, but are rarely studied simultaneously.
Do male guppies in pools with pike cichlid fish have brighter color patterns than females in the pool?
Male guppies have highly varied color patterns, which are controlled by genes that are only expressed in adult males. Female guppies choose males with bright color patterns as mates more often than they choose males with drab coloring.
What makes a good hypothesis?
A good hypothesis is stated in declarative form and not as a question. “Are swimmers stronger than runners?” is not declarative, but “Swimmers are stronger than runners” is. 2. A good hypothesis posits an expected relationship between variables and clearly states a relationship between variables.
What are the 3 types of hypothesis?
Types of Research Hypotheses
- Alternative Hypothesis. The alternative hypothesis states that there is a relationship between the two variables being studied (one variable has an effect on the other).
- Null Hypothesis.
- Nondirectional Hypothesis.
- Directional Hypothesis.
What is the genetic difference between light and dark colored mice?
The difference between dark and light mice boils down to a difference of four chemical letters in a gene called MC1R. Because the gene controls the amount of dark pigment in a mouse’s hair follicles, a mouse with these mutations grows dark fur, which gives it an advantage on a dark background.
What caused the dark variation in the rock pocket mice?
One gene, called Mc1r, stimulates production of the black pigment in coat fibers. Nachman’s group made an educated guess that genetic differences in either the Mc1r or agouti genes might account for the dark pelage of rock pocket mice living in the volcanic areas.
Why are some mice light colored and some mice dark colored?
Why were some mice light colored and some mice dark colored? Light colored pocket mice were at an advantage because they can hide easier from predators. Dark colored mice on the other hand were at a disadvantage because they were easily exposed to these visual predators.
What’s the definition of natural selection?
Natural selection is the process through which populations of living organisms adapt and change. Individuals in a population are naturally variable, meaning that they are all different in some ways. These individuals then pass the adaptive traits on to their offspring.
Which of the following about natural selection is true?
The correct statement is – Natural Selection is the process by which ‘organisms with more beneficial traits’ are likely to survive and reproduce. EXPLANATION: Natural selection is the process of ‘differential survival’ and ‘reproduction in organisms’ that have different phenotype.
Can prediction result in natural selection for color patterns in guppies?
Can predation result in selection for color patterns in guppies? Predation results in selection for more drab color patterns in guppies. Researchers further hypothesized that if predation pressure is reduced, drab coloration would become less beneficial (since females prefer brightly colored mates).
Why do female guppies prefer brightly colored males?
Although conspicuous visual sexual signals, such as bright colors, in males serve to attract females in numerous species, they may also attract the attention of potential predators and thus may be costly in terms of increasing individual risk of mortality to predation.
Why are male guppies so colorful?
So why only males get these vivid colours? Scientists now say that male guppies have chromosomes that only exchanges genes at their very tips. This means that colours are passed to males only and are inherited almost unchanged. It also means that these colours are not passed to female offspring.
What factors caused the variation in the colors of the guppies?
The color patterns of male guppies are influenced by both sexual and natural selection (Endler 1978, 1983). Sexual selection (female mate choice) often (although not always) favors more colorful males (Houde 1987; Endler and Houde 1995; Brooks and Endler 2001).
