28. The sperm count of the human population of developed societies has dropped from 130 million per ml to 50 million per ml in recent years. This is an example of A. directional selection B. disruptive selection C. sexual selection D. stabilising selection

Q: 3. a. Why are most populations not in Hardy Weinberg Equilibrium?   b. There is an ancient village…

A: Answer : Most populations do not conform to Hardy-Weinberg equilibrium (HWE) due to several…

Q: Which of the following evolutionary mechanisms can introduce new new alleles into a population's…

A: Over repeated generations, evolution is defined as a variation in the genetic variation of…

Q: which of these is not a central rule of natural selection  a, fitness to the general health and…

A: Natural selection is that the process through which populations of living organisms adapt and alter.…

Q: has rebounded (i.e., has returned to higher numbers), but is now homozygous for nearly every gene is…

A: Lots of elephant seal population were killed, suggesting that the hunting is also a random event.…

Q: Refer to the following to answer the two questions that follow: A population begins with 100…

A: The population initially have 100 individuals with genotype Aa. After 10 generations,  Number of…

Q: This theory states that organisms with desirable characteristics may survive while those with weaker…

A: According to the guidelines multiple questions need to be submitted separately.  The first one is…

Q: Which of the following types of selection could result in a loss of genetic variation in a…

A: The natural selection is a process by which one trait has getting the advantages over the other…

Q: Which among the following is NOT a principle of natural selection?  a. The genes produced are a…

A: According to the theory of natural selection given by Darwin it is said that nature selects the best…

Q: 1.True or false: If the Hardy-Weinberg equation predicted a homozygous recessive genotype frequency…

A: 1) False 2)True 3)True 4)True

Q: As scientists in Canada traveled further north into colder climates measuring the size(mass) of…

A: Bergmann's rule is an ecogeographical rule that claims that larger creatures are found at higher…

Q: Which of the following is an advantage of sexually reproducing populations over asexually…

A: The process of the formation of new organisms from existing organisms is called reproduction. There…

Q: Which of the following are traits typical of intrasexual selection?   a. Weapons   b. Choosiness…

A: intrasexual selection refers to competition with members of the same sex.It occurs when members of…

Q: Stabillizing selection means

A: 3 . The extreme population have a lesser chance of survival than the median members In Stabilizing…

Q: When we take, say, 100 individuals of a species of beetle from the wild and place them in a new…

A: Each environment that an organism inhabits is distinct from the others. Its natural habitat is…

Q: Bateman (1948) and Trivers (1972) came to the conclusion that sexual selection is typically a more…

A: Sexual selection is a type of natural selection for meeting success of any species. In this type of…

Q: 47. Which of the following processes is never favorable to the origin of a new species? A. genetic…

A: The origin of species depends on several evolutionary factors. The speciation is responsible for…

Q: How does sexual selection differ from natural selection? a. It does not require heritable traits. b.…

A: Natural selection typically results in people who are well-adapted to their environment, whereas…

Q: 4.  Behavior is the result of a.    neural networks. b.    hormonal interactions. c.    genetic…

A: Note: Please upload question no. 6 separately. Answer: 4 Introduction: Behaviour is the immediate…

Q: 12. Which can bring new traits to a population and why? 1. natural selection - because it increases…

A: what is mutation ? Mutation is change in the genetic material of a cell(organism's DNA) that can be…

Q: 4. The roof rat (Rattus rattus) and the Norway rat (Rattus norvegicus) are unable to interbreed…

A: According to biological species concept two different species can't reproduce and produce fertile…

Q: A. a population of lizards may be brown or red. The temperature of the eggs determines the color of…

A: Natural selection is the non random process that drives evolution.

Q: What does this figure show? Thorns have their own unique DNA which evolves separately from the…

A: The figure shows cactus in a desert area.  Cactus belongs to the family Cactaceae. These are…

Q: 24. The Hardy-Weinberg equation accurately predicts allele frequencies for a population only if a.…

A: Hardy-Weinberg law states that in a large population, the gene frequencies of various kinds of genes…

Q: 10. The herbivorous Japanese ladybird beetle Henosepilachna yasutomii (which feeds on blue cohosh),…

A: Here,the answer is C)habitat isolation. The Japanese lady bird beetle Henosepilachna yasutomii grows…

Q: Which of the following would be the worst example of convergence? a. Elongated wing feathers in two…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: Explain how sexual selection might lead to a)sexual dimorphism and b) members of one sex (usually…

A: (a) Sexual selection leads to sexual dimorphism as males of a species make extreme efforts to…

Q: Identify the indicated part of the cochlea histology model. cochlear duct vestibular duct tympanic…

A: The organs of hearing and equilibrium are a pair of ears which are situated on the sides of the…

Q: Give an example of a positive effect of selective breeding. (It can be ascertained from the article,…

A: It is a breeding method where 2 individuals of the same species with desired characters mate with…

Q: Hominid brain size has increased over the last 3 million years. This is probably due to:   A.…

A: Change in beak is a directional change. Homo sapiens sapiens has the largest brain.

Q: Sexual selection can be driven by ________.   A. ecological factors favoring r-selected genotypes…

A: There are mainly two types of interaction:- 1) Positive interaction 2) Negative interaction Among…

Q: 21. What is an example of microevolution? Group of answer choices a.Anole lizards getting stickier…

A: Species diversity is a measure of biological variety seen in a certain ecological community,…

Q: Darwin's finches, which inhabit the Galapagos Islands, originally migrated from mainland South…

A: A . directional selection.

Q: If the average phenotype of a trait in a population remains unchanged for a very long period of…

A: Whenever the average phenotype and hence genotype of population remains unchanged for a very long…

Q: Which of the following does not alter allele frequencies? a.Inbreeding b.Gene flow c.Genetic drift…

A: Frequency of occurrence or proportions of different alleles of a particular gene in a given…

Q: )In many species of turtles, sex is not determined by sex chromosomes (like in mammals and birds)…

A: In most species, gender is determined during fertilization. However, the sex of most turtles,…

Q: What condition(s) is/are necessary for the development of both antagonistic and mutualistic…

A: The diversity of species is explained by evolution as a result of descent with modification.…

Q: Some antibiotics used to treat infections in humans are also used to treat chickens, but some groups…

A: Q. Some antibiotics used to treat infections in humans are also used to treat chickens, but some…

Q: In human populations birth survival rates tend to increase towards children born with a more average…

A: Natural selection is a process through which organisms better adapted to the environment survive and…

Q: What kinds of limited resources can create a struggle between individuals in a population? 2. What…

A: Evolution is a continuously occurring natural process that involves a genotypic or phenotypic change…

Q: 1.What does a male cricket need to be able to reproduce?  2. Is calling good or bad for a cricket's…

A: As per our guidelines, we are supposed to answer only three sub-parts. Kindly repost the question…

Q: 27. Which of the graphs above shows that one extreme phenotype is favored, possessing a higher…

A: Natural selection is a theory that states that organisms evolved by changing their heritable traits…

Q: In the course of human evolution, we can see in the fossil record a tendency towards increasingly…

A: Selection is the result of all combined forces that cause survival difference as well as…

Q: 55. true or false: natural selection involves genetic variation differential reproductive success…

A: Evolution can be described as a slow process in which species adapt to genetic changes according to…

Q: Would you expect sexual selection to increase or decrease adaptation of a population to its…

A: The biological selection where the members of one biological sex chooses the opposite sex member for…

Genetic Variation

Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.

Quantitative Genetics

Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.