In a population, there are two different alleles for a gene. D is dominant and d is recessive. If two organisms that are Dd mate, which of the following lists the results possible offspring? 1.Dd and dd 2.DD, Dd, and dd 3.All Dd 4.DD and dd
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In a population, there are two different alleles for a gene. D is dominant and d is recessive. If two organisms that are Dd mate, which of the following lists the results possible offspring?
1.Dd and dd
2.DD, Dd, and dd
3.All Dd
4.DD and dd
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Solved in 4 steps
- What is the selective factor, or selective environment, in the case of sexual selection, that allows individuals with some genotypes to leave more offspring than individuals of other genotypes? Choose the best answer from the available options. Group of answer choices A-Sickle-cell disease B- AIDS C-Human preference D-Malaria E-Female preferenceEusociality and haplo-diploidy, in ants and bees, are often (though not always) correlated because… Group of answer choices: A. having twice as many genes allows queens to be far more capable of controlling other individuals. B. being able to control the sex of offspring allows parents to regulate the amount of cooperation. C. a worker can have more of her genes passed on in a new sister than in an offspring of her own. D. males have fathers but females don’t. E. it allows high levels of inbreeding to evolve without negative effects.The pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes? * nd 2 school The proportion of DDT-resistant mosquitoes in a population remains constant due to the metabolic costs of DDT utilization DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT. A population of 1.492 finches is introduced to a rainforest. Over the next year, the finches showa death rate of…
- 1 Refer to the following to answer the two questions that follow: A population begins with 100 individuals who have the genotype Aa. After 10 generations of breeding, there are 20 AA, 40 Aa, and 40 aa. 24. How many A and a alleles are present after 10 generations? Use the method you used in the allele frequency simulation. a. 80 A; 80 a b. 60 A; 120 a ✓ c. 40 A; 80 a d. 80 A; 120 a e. 120 A; 80 a leles after 10 generations? Use the method you used in theThe twofold cost of sex model by John Mynard Smith explains how - A. asexual females can become predominant in a population. B. anisogamy results in sexual reproduction. C. sexual individuals can produce genetically variant offspring. D. asexual females invest as much in offspring as the sexual females.The Old Order Amish is a relatively small population of individuals found in the United States in Pennsylvania and Ohio. They are a very isolated population due to their strong religious beliefs and lifestyle that have continued for more than 200 years. They mostly select mates from within their own population, which has had significant effects on their gene pool.The effects on their gene pool is a result of a. non-random mating b. founder effect c. mutation d. bottleneck effect
- Imagine a population of crabs living on a white sandy beach. The crabs ONLY occur in two color - red and blue, each controlled by color genes. Over time, will the crab population shift toward white? Why or why not?1. A population of snails that has striped and unstriped individuals has recently moved into a new region. Birds break the snails open by dropping them onto the rocks. The birds eat the bodies of the snails and leave the shells. In one area, researchers counted both live snails and broken shells. The data are summarized below. Number of Snail Shells Striped Shells Unstriped Shells Snails living snails broken (dead) 264 296 486 277 snails a) Analyze the data. Which form of snail (striped or unstriped) is more likely to be caught by the birds for food? Explain how you know. b) Suggest a hypothesis to explain what is happening to the snails. c) Predict and explain how the frequencies of striped and unstriped individuals in the population might change over many generations.The pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes?* nd 2 chool The proportion of DDT-resistant mosquitoes in a population remains constant due to O the metabolic costs of DDT utilization DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT. A population of 1.492 finches is intróduced to a rainforest. Over the next year, the finches show a death rate of…
- A fungus goes through a population of worms killing most of them. It appears that this fungus kills any worm that becomes infected. No worms have any genetic advantages. A small group of worms survives by sheer luck. And by coincidence (i.e. not related to the fungus) these worms all have a rare allele for blue skin. The blue color seems to have no affect in their survival nor reproduction. The survivors reproduced and the population gets back to its normal number. But most worms now have the blue skin allele. The increase in this allele was due to: Group of answer choices natural selection non-random mating genetic drift 12A fungus goes through a population of worms killing most of them. It appears that this fungus kills any worm that becomes infected. No worms have any genetic advantages. A small group of worms survives by sheer luck. And by coincidence (i.e. not related to the fungus) these worms all have a rare allele for blue skin. The blue color seems to have no affect in their survival nor reproduction. The survivors reproduced and the population gets back to its normal number. But most worms now have the blue skin allele. The increase in this allele was due to: Group of answer choices natural selection non-random mating genetic drift macroevolution 121. The image shows a model of a reproductive strategy of an 2. The bird in the picture feeds on mice. A major forest fire resulted in a layer of ash that darkened the soil on which the mice lived. The illustration shows the distribution of mice over time. organism. What type of reproduetive strategy is shown in the model Make a claim about why the color distribution in the mouse population changed over time. Provide evidence to support and what is an evolutionary disadvantage of it? your claim. 1 2 3 Number of Weeks after the Forest Fire