What is the one defining characteristic that determines a mammal?

Q: Is the embryonicdevelopment in birds direct orindirect?

A: Animal developmental process can be direct or indirect. Direct development: It refers to the…

Q: Which of the following is true about identical twins?

A: Answer - They develop from a single fertilized egg that split into two Identical twins are also…

Q: Some marine fishes exhibit a spectacular polyphenism, in that individuals can, under special…

A: Sequential hermaphroditism occurs when the individual changes sex at some point in its life and…

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: What selective forces might limit the stage of development at which humans are born?

A: Introduction: The evolution of humans are influenced by the following five factors: Natural…

Q: Answer the following questions regarding adaptive and non-adaptive developmental plasticity:  a)…

A: Introduction :- Evolution is defined as the descent with modification , it is a slow and gradual…

Q: What is delayed implantation? Why is it important in marine mammals?

A: It is a reproductive strategy used by approximately 100 different mammals in seven or eight…

Q: Amniocentesis and genetic screening reveal that a fetus carries a defective L1-CAM gene. What…

A: Amniocentesis and prenatal testing are the diagnostic tests performed before the child's birth. This…

Q: How do the location and the relative size of the bulbourethral glands of the fetal pig compare with…

A: Reproductive system is used for the sexual reproduction. Female internal reproductive organs include…

Q: The macaw has a large beak that allows it to break through large nuts to get to the sweet fruit and…

A: Macaw  Macaw are the colourful parrots with long tail. They are considered as new world parrot.

Q: With regard to development, what are the roles of the maternaleffect genes versus the zygotic genes?…

A: Maternal-effect is a phenomenon in which the phenotype of the offspring is defined by the genotype…

Q: The development of sex and gender is a good example of a developmental cascade because:   Group of…

A: Developmental Cascade:  Developmental cascades refer to collective influences on the development of…

Q: For these organisms to develop into functional offspring of that species, which one of the following…

A: Introduction Embryology is a branch of science which deals with the study of embryonic development.…

Q: Virtually all steps of embryological development depend on: a. Alterations in the genome b. Tumor…

A: Embryological development is the growth and development of embryo by  cell division and cell…

Q: In rodent development, what would happen if there was no x-fetoprotein to bind the circulating…

A: Introduction  Alpha-fetoprotein (AFP) is a protein that is normally produced during fetal…

Q: 3. During the course of successful prenatal development, a human organism begins as a(n): A) Zygote…

A: The goal of developmental biology is to comprehend how an organism develops—how a single cell…

Q: What are the notable features of the fetuses of penguin, panda, and snake that they have in common?

A: Vertebrates include five major classes i.e., Pisces, Amphibia, Reptilia, Aves, and Mammalia. They…

Q: State the neuromere origin of each brain region?

A: Introduction Neuromeres Are Known As The Segments Of The Neural Tube That Forms The Embryonic Brain…

Q: What Are the Principles of Animal Development?

A: The principles of animal development provide answers to various questions that might arise in mind…

Q: Which of the following is a reasonable explanation for this pattern? Group of answer choices   A)…

A: Neoteny  The traits which is seen in the juvenile and remain unchanged as the organism grow. It is…

Q: Which of the following rows correctly identifies the development of the germ layers? Select one:…

A: The germ layers are an embryonic collection of cells that aid in the creation and development of…

Q: Identify all species pair(s) who have the most similar DNA sequence and clearly explain why. Would…

A: A phylogenetic tree is a tree-like diagram depicting relationships and relatedness between organisms…

Q: Gli3 and distal Hox gene expression Gradual reduction in distal Hoxd dosage Ноxd13 +/+ +/- +/+ +/-…

A: Hox genes specifies the identity of the limb region. It also sepcifies whether a particular…

Q: The fast block to polyspermy in sea urchins (a) is a depolarization of the egg plasma membrane (b)…

A: The egg's blocks to polyspermy (fertilization of an egg by more than one sperm) were originally…

Q: 6. A male newborn has renal agenesis on the right. Which of the following primitive rudiments most…

A: Introduction:-  Renal agenesis is a rare condition in which one or both kidney are not present in…

Q: Consider the variation in reproductive systems within the animal kingdom. These are discussed in the…

A: Refer to the solution

Q: describe direct and indirect development and name some animal groups that have each type of…

A: Difference between the direct ns indirect development is listed below.

Q: What are the molecules being secreted by the organizer in a regional fashion such that the first…

A: Development of embryo -- The development in developmental biology gave a milestone by the discovery…

Q: Suppose we would want to have mirrored lateral sides (meaning both the left and right portion are…

A: The majority of animals have bilateral symmetry. They have anterior-posterior (A-P) and the…

Q: Explain how Hox gene expression affects vertebrate development.

A: Hox genes are a set of transcription factor genes that are responsible for the development of…

Q: Which of the following correctly identifies the different phases of human development? Select one:…

A: Human development  It is the process of development of the human body , which begins with the…

Q: Why is it more difficult to determine the sex of a newlyhatched canary than a newborn puppy?

A: A sex-determination mechanism is a physiological system that controls how an organism's sexual…

Q: The opening between the two atria is found in a placental mammal fetus is called the:

A: The heart is the most vital organ of the body in biological organisms that works continuously from…

Q: What are some of the applications of animal reproduction and development in the real world?

A: Procreation is another term for reproduction. This is the biological process by which navel…

Q: Whether the statement "Because of the many later developmental transformations that produce the…

A: Gastrulation is the process by which the blastula develops into the three-germ layered gastrula.…

Q: According to the film, "Your inner reptile," which of the following did we inherit from our…

A: The question is asking us to identify which traits we, as humans, have inherited from our reptilian…

Q: What is the difference between direct and indirect development?

A: Development refer to the process of the formation of the adults from the progeny stage. There are…