Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. What do you mean by Chromosome Number?
We are generally aware that the number of chromosomes in each cell of all individuals of a single species is constant. ,It is also established that the more closely related species are likely to have similar chromosome numbers while the more distantly . related ones shall have different numbers. Due to this' relative conservativeness, chromosome number becomes an important and frequently used taxonomic character. In addition, there is a very wide range of chromosome numbers. in the angiosperms from as low as 2n = 4 (in Haplopappus gracilis) ('Asteraceae) to as high as 2n = 530 (in Poo litterosa) (Poaceae). A large number of angiosperms have been analysed for their chromosome numbers, providing useful taxonomic information.
Many interesting ideas have developed from knowledge of chromosome numbers. For example, in the genus Festuca, different species have different chromosome numbers forming a mathematical series. The chromosome numbers are 2n = 14,28, 42, 56, 70, etc. From this information, a generalisation can be made, that different species may have some common basis. If we assume that these chromosome numbers are based on a common denominator called x (and x = 7), then we can consider the different species to have multiples of this number. This denominator or base number (x = 7) can be considered as the basic set of genetic information carried by a plant, and due to the multiplication of this basic genetic set, the eiiolution of different species has occurred. Such a series is said to be polyploid in which the basic number (x) is equivalent to the haploid number of chromosomes in a diploid species (i.e. x = n = 7). The other species would then be tetraploid, hexaploid, octaploid, decaploid, etc. respectively.
Q. What is Polyethylene? Polyethylene (P) (Low density polyethylene (LDPE), medium density, linear low-density (LLDPE), high-density polyethylene (HDPE) and ethylene vinyl acet
Q. Direct use values of biodiversity? Direct use values are for those goods that are ensured directly e.g. food and timber. Maintaining a wide range of components of biological
By now you know that diabetes cannot be cured but can be treated so that an individual leads a normal life. Patients who maintain their blood glucose levels within the normal range
details of these blood groups
Companion cells are the specialized cells in the phloem which load sugars into the sieve elements and help to maintain a functional plasma membrane in the sieve elements.
What are the adaptions flatworms neeed in order to live in their environment?
Which is the part of the human visual system where the receptors that sense light, i.e., the photoreceptor cells, are located? How do those cells work? The photoreceptor cells
Prothoracic Gland or PTC Prothoracic gland (PTC) or moulting gland and ecdysone or moulting hormone The 3 rd endocrine gland-prothoracic gland- is an irregular branching
what is the classification of skeletal tissue?
Weiss's Theory of Fibroosseous Fixation Weiss' theory stated that there is a fibro-osseous ligament formed between the implant and the bone and this ligament can be considered
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd