Match each of the descriptions (a through d) with the correct theory or concept listed below. Preformationism Pangenesis Germ-plasm theory Inheritance of acquired characteristics a. Each reproductive cell contains a complete set of genetic information. b. All traits are inherited from one parent. c. Genetic information may be altered by the use of a characteristic. d. Cells of different tissues contain different genetic information.

Q: A preembryo has:- a. A neural tube. b. A heart bulge. c. A cytotrophoblast. d. A coelom. e. decidual…

A: Cell denotes the primary structural and functional unit of all living organisms. Scientists…

Q: Outline the concept of pangenesis and explain how it differs from the present-day germ-plasm theory.

A: Darwin proposed the theory of Pangenesis in 1868. “Pan” means whole and “genesis” means indicating…

Q: The lens of the vertebrate eye develops only after the head ectoderm comes in contact with the optic…

A: Eye development in vertebrate take place during the late phase of gastrulation. Eyes are the…

Q: It is said that sexual reproduction is selectively advantageous to asexual reproduciton. Why is the…

A: Reproduction is process in which genetically or biological similar offsprings are produced .…

Q: 1. Which of the ff is NOT a form of asexual reproduction? A. Budding B. Fission C. Fragmentation D.…

A: Introduction :- In biology, budding is a type of asexual reproduction in which a new individual…

Q: If an egg cell were treated with EDTA, a chemical that bindscalcium and magnesium ions,(A) the…

A: EDTA - Ethelene diamine tetra acetic acid is a chelating agent and is very effective chelator of…

Q: Which of the following steps of sea urchin fertilization initiates the formation of the…

A: Fertilization is the union of male ( spermatozoa ) and female ( ovum ) gametes which results in the…

Q: Which statement about menopause is  most correct? A. Menopause has to be adaptive because…

A: C. Several hypotheses for menopause as an adaptation have been proposed, but more evidence is…

Q: _____ is the transmission of DNA to offspring.     a. Differentiation   b. Inheritance   c.…

A: In genetics, the genetic material is located in the nucleus, cytoplasm, and mitochondria of the cell…

Q: No two people are genetically identical, except for identicaltwins. The main source of genetic…

A: Reproduction is the biological process by which new individual organisms called offspring are…

Q: Which of the following is TRUE about neurulation? (Check all that apply) A The detail mechanism…

A: Introduction :- Neurulation is the folding process in vertebrate embryo which includes the…

Q: In species with environmental sex determination, a. sex is determined during development as an…

A: A sex-determination framework is a natural framework that decides the improvement of sexual…

Q: How many functional eggs (ova) result from one oogonium?     A. 1 and 3 polar bodies   B. 18…

A: In sexually reproducing organisms haploid gametes are produced. Female gametes are called eggs…

Q: Compare the relative sizes and shapes of the area pellucida and opaca as seen in the 13-hour,…

A: * At 13 hours after incubation the egg shows differentiation of blastodisc into area pellucida and…

Q: A baby born four weeks before its due date is most likely to have anunderdevelopeda. central nervous…

A: The central nervous system begins developing two weeks after fertilization and continues developing…

Q: Why is the frog pattern of cleavage different from the sea urchin pattern of cleavage? Group of…

A: Option B

Q: Sexual reproduction provides an advantage to organisms because it increases the   A. size of the…

A: Introduction: Sexual reproduction is a type of reproduction that involves the fusing of male and…

Q: An organism produced a new individual without any help of another individual. A.Parthenogenesis…

A: Reproduction is one of the most important and fundamental processes of life where 'parents' produce…

Q: In animals, a key difference between spermatogenesis andoogenesis is thata. only oogenesis involves…

A: Reproduction refer to a biological process in which new organisms are produced from their parents.…

Q: Unchanging environments are advantageous to organismsa. that reproduce asexually.b. that undergo…

A: Asexual reproduction is the type of reproduction where there is no fusion of male and female gametes…

Q: Evolution (Define)

A: Life on earth was estimated to have appeared 3.5 billion years ago. There are multiple theroies on…

Q: Somites a. begin forming at the tail end of the embryo and then move forward in a wavelike…

A: Introduction: Somites can be defined as the longitudinal series among other series of blocklike…

Q: f heredity is the passing on of traits from arents to their offspring, how is evolution possible?

A: In simple words, evolution is the process of gradual changes taking place over generations…

Q: Describe the experiment that showed scientists that the 6 layers of the neocortex develop through an…

A: The brain is essentially a control center. It sends messages through nerve cells to make our bodies…

Q: Sexual reproduction ________. A) allows animals to conserve resources and reproduce only during…

A: Sexual reproduction is a beneficiary phenomenon that provides constant supply of unique organisms…

Q: Opposite the micropylar end, is the__________, representing the basal partof the ovule.A. hilum B.…

A: The ovule is the female reproductive cells. In plants, the ovule consist of three parts namely the…

Q: 4. Sarcomas and hematopoietic cancers are both derived from which germ layer? A. Ectoderm B.…

A: "Cancer" is a fatal disease that has both physical and mental consequences for a person. Cancer can…

Q: If cells from the presumptive neural ectoderm of a frog gastrula are transplanted onto the surface…

A: The gastrula formation occurs during the early stage of cell development. During gastrulation the…

Q: Briefly describe the Red Queen hypothesis, including (1) what biological phenomenon it explains, and…

A: Natural selection is a process that results in the adaptation of an organism to its environment by…

Q: What type of reproductive strategy is shown in the model and what is an evolutionary disadvantage of…

A: The reproductive strategy is shown in the model and an evolutionary disadvantage of it is:   B.…

Q: D Which of the structures includes the usual site of fertilization? O A O 3 O 2 O 5

A: Fertilization is a process of fusion of haploid gametes (egg and sperm) to form a diploid zygote.

Q: In mammals, primordial germ cells migration ends when they reach the _________________   posterior…

A: Primordial germ cells (PGCs) are highly specialized cells that act as precursors of gametes, which…

Q: Prezygotic reproductive isolation can occur O a. during embryo development b. during fetal…

A: A prezygotic reproductive barrier is a mechanism that prevents fertilization from occurring.

Q: The function of mitosis is: A. growth of the organism and tissue repair.   B. to ensure that each…

A: Mitosis is the phase of the cell cycle where the nucleus of a cell is divided into two nuclei with…

Q: In the list of animals given below, hen is the odd one out.Human being, cow, dog, henThe reason for…

A: Reproduction is a process through which an organism produces organisms of similar kinds. It is of…

Q: Prezygotic reproductive isolation can occur O a. during embryo development O b. during fetal…

A: Prezygotic repreductive isolation occurs before the formation of zygote.

Q: Which of the following statements CORRECTLY describes the contribution of sperm to the zygote for…

A: Sperm although has all the components mentioned in the question, the following happens to them: -…

Q: What is the primary purpose of the fertilization membrane? a)Provide the growing embryo with food…

A: Sperm and egg (ova) are male and female gametes respectively. Fertilization is key process in sexual…

Q: Which of the following statements is TRUE? A. Animals with indirect development requires external…

A: Correct option is C. Parthenogenesis is a form of sexual reproduction Parthenogenesis is commonly…

Q: The ______  suggests that natural selection will favor pathogens that can overcome the defences of…

A: Natural selection is the process through which population of living organism change and adapt.

Q: Which of the following is an advantage of asexual reproduction over sexual reproduction?   A.…

A: To find Which of the following is an advantage of asexual reproduction over sexual reproduction

Q: A change in the amount of yolk and its distribution in the egg will affect:   A Fertilization…

A: Fertilization is the fusion of haploid male and female gamete results in the formation of the…

Q: mammals, primordial germ cells migration ends when they reach the _________________   posterior…

A: Premordial germ cells are only means of genetic transmission between parent and offspring.…

Q: Why do sea urchins have external fertilization?

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

Q: Compare and contrast Ontogenetic vs. Phylogenetic Development

A: Since you asked multiple questions we will answer the first question for you. If you want any…

Q: If there are 400M ovum/egg cells in a 1point woman's body, how many primary oocytes are there during…

A: An oocyte is essentially an immature egg. Oocytes becomes mature within follicle. These follicles…

Q: Embryos with cleavage pattern depicted in panel B exhibit mosaic development. B A) True B) False

A: Embryo  In developmental biology, the early stage of multicellular organism that is form by…

Q: Characters that are transmitted from parents to offspring during reproduction show:a) only…

A: Now it is well known that DNA is transmitted through the sexual reproduction from the one generation…

Q: Compare and contrast sexual and asexual reproduction.  Identify the most accurate statement.   a.…

A: Introduction A Single Parent Is Involved In Asexual Reproduction. It Produces Genetically Identical…

Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.