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What is the diploid number of a mule and why is it that they are infertile?
The diploid number of a mule is 63. Mules have an odd number of chromosomes (63) - which means that the chromosomes do not pair off properly. This causes problems with meiosis, which is the process that creates the gametes (sex cells) that will be involved in sexual reproduction. This is why almost all mules are infertile. Mules are the result of a cross between two species. By definition, the offspring from two different species cannot be fertile. However, there are a few very rare cases of a female mule having a viable offspring.
What kind of reproduction causes variation in organisms?
Sexual reproduction causes most variation in organisms. This is because genes get mixed up in the process whereas in asexual reproduction the offspring is genetically identical to the parent.
Summarise the causes of gene and chromosome mutation and suggest how these changes can bring about evolutionary changes by the process of selection using named examples?
http://wiki.answers.com/Q/Summarise_the_causes_of_gene_and_chromosome_mutation_and_suggest_how_these_changes_can_bring_about_evolutionary_changes_by_the_process_of_selection_using_named_examples"
How do natural selection cloning and selective breeding lead to evolutionary change?
The only thing that causes evolution is Mutations due to forced natural selection of desired alleles.
If you cross a homozygous dominant striped cat with a homozygous recessive spotted cat. What will be the phenotype of the hybrid offspring?
It is not fully known whether it is a recessive gene that causes spots on a cat, but fom a mathematical point of view, you would only get striped offspring.
Do cat's hairs make women infertile?
No, it is not true that cat hair causes a woman to be infertile. This is nothing but an old wives tail.
What is the diploid number of a mule and why is it that they are infertile?
The diploid number of a mule is 63. Mules have an odd number of chromosomes (63) - which means that the chromosomes do not pair off properly. This causes problems with meiosis, which is the process that creates the gametes (sex cells) that will be involved in sexual reproduction. This is why almost all mules are infertile. Mules are the result of a cross between two species. By definition, the offspring from two different species cannot be fertile. However, there are a few very rare cases of a female mule having a viable offspring.
What causes reflux?
Changes in the barrier of the stomach and esophagus.
What are two causes contributed to dust bowl?
Drought, and infertile land
Causes of infertile soil?
In fertile soil is caused by the absence of the necessary nutrients and sufficient minerals within the soil.
What forms offspring similar to parent?
Sexual reproduction produces offspring similar to parents. Asexual reproduction causes the offspring to be exactly the same as the one parent.
How are new species created?
Through Speciation - an evolutionary process which causes organisms which were once of the same species to become genetically distinct from one another (over numerous generations) to the point where they can no longer produce fertile offspring More info: http://en.wikipedia.org/wiki/Speciation
What is a infertile hybrid?
It is most common when two organisms of different species attempt to reproduce. The combination of genes is usually not fully functional meaning that the offspring is unable to reproduce itself. This can also occur in plants although to a lesser extent as plants are capable of polyploidy. In humans polyploidy causes complicated genetic diseases.
What are the probable causes of testes not dropping?
If the testes don't descend (drop) after birth, then the male can become sterile (infertile), and the risk of testicular cancer increases.
What is incident wavefront?
The incident wavefront is the crest of the wave before it hits a barrier which causes it to reflect
Should we build or not build barrier islands?
no people should not build on barrier islands because it causes soil erosion... and soil erosion is bad :) hahaha be an erosion freee world
What causes a geographical barrier?
A natural part of the earth which is difficult to cross, such as mountain ranges or wide rivers.
