WebApr 4, 2024 · Fertilization in advanced plants is preceded by pollination, during which pollen is transferred to, and establishes contact with, the female gamete or macrospore. Fusion in advanced animals is usually followed by penetration of the egg by a single spermatozoon. WebApr 1, 2024 · We described the early development of the thyroid and endostyle in two extant cyclostomes and found that the histological features and the regulatory gene …
NCERT Exemplar Solution for Class 11 Biology Chapter 4 - BYJU
WebThe primary or the solitary job of gametes is to carry out fertilization in sexually reproducible organisms. During fertilization, a male gamete (sperm/spermatozoa) fuses with female gamete (egg/oocyte). The sex of an organism can be holistically distinguished by the presence of morphologically distinct types of sex cell/gamete. Web1. In some animal groups, the body is found divided into compartments with a serial repetition of at least some organs. This characteristic feature is called a. Segmentation b. Metamerism c. Metagenesis d. Metamorphosis Solution: Option (b) is the answer. 2. Given below are types of cells present in some animals. Which of the bray school 5 million
Cephalochordata - an overview ScienceDirect Topics
Web(b) Fertilization is internal and development is indirect in sponges (c) Sponges exhibit cellular level of organization as cells in them are arranged as loose cell aggregates (d) All sponges are asymmetrical i.e., any plane that passes through the centre does not divide them into equal halves. Medium View solution > View more More From Chapter WebOct 27, 2011 · At 9 and 11 days after fertilization, we found expression of Hand, Ascl1 and Phox2 in the head region, with only Phox2 showing additional expression in a stream of cells that migrate toward the trunk. ... While this suggests the presence of sympathetic activity in cyclostomes, ganglionic structures are absent in the trunk and tail of the ... WebMay 29, 2024 · Page by: Jonathan R. Hendricks, Paleontological Research Institution, Ithaca, New York This page was first publicly announced on May 29, 2024. Chapter contents: Chordata: Overview and Basal Taxa Jawless Vertebrates ← Note: Additional pages are in preparation. Topics covered on this page: Overview; Cyclostomes; … brays chapel church of god