Waste products leaving the cell
Answer: The following is a <u>postzygotic isolating barrier </u>:
- The hybrid offspring of two species of crocodiles can produce normal gametes but cannot obtain a mate.
Explanation:
<em><u>Reproductive isolation </u></em>occurs when <em>barriers prevent</em> two populations from interbreeding , <u>keeping their gene pools separate.</u>
We can find the Prezygotic isolation that occurs<u> before fertilization </u>can happen.
And the Postzygotic insolation barriers are the reproductive insulation processes that<u> act after the mating</u>. They are all that concern the viability of the individuals produced.
Prezygotic isolation barriers can be temporal, behavioural, geographic , ecological or mechanical; whereas postzygotic isolation barriers include the inviability, infertility or breakdown of hybrid organisms
Cell
Tissue
Organ
Organ system
Organism
Brain, spinal cord, nerves
The brain controls thought, behavior, emotion, memory, and basic life functions. The brain is also the origin of control over body movement. The spinal cord connects the peripheral nervous system (PNS) to the brain; nerve impulses reaching the spinal cord through sensory neurons are transmitted up into the brain. Nerves primarily involve control and coordination of all parts of the body.
The nervous system interacts with every other organ system. For example the hypothalamus in the brain controls the pituitary gland and tells it when to produce hormones, this shows that the nervous system interacts with the endocrine system.
Hope this helps :)
Proteins – what they are and how they're made. Proteins are the key working molecules and building blocks in all cells. They are produced in a similar two-step process in all organisms – DNA is first transcribed into RNA, then RNA is translated into protein.
Answer:
Pollination: a. pollen tubes grow down the style.
Fertilization: c. 2 sperm are discharged into the female gametophyte.
d. sperm fuse with the egg & 2 polar nuclei
Seed development: b. generative, cell divides, forming 2 sperm.
e. zygote forms & divides into a terminal cell & a basal cell
f. cells of the embryo differentiate into three tissue types
Explanation:
Fertilization is the fusion of one or more sperm with an egg or the female gametophyte in the case of vegetables as option C and D describes.
Pollination is the process that flower plants use to reproduce with the help of insects that transport pollen from one flower to other depositing it in the pollen tubes that grow down the style in order to connect with the ovary of the flower as option A describes.
As regards seed development once that the fertilization is finished the seed starts to grow as option E and F describes. Option B describes the development of sperms, this process occurs before fertilization and through mitosis and meiosis.
