please someone do this
a) Write two reptilian and two avian characters of Archaeopteryx.
b) Write two differences between homozygous and heterozygous
organisms.
c) Write two significance of micropropagation.
d) Write two differences between mitosis and amitosis.
e) Compare the inheritance of acquired characters by Lamarck to
inheritance of useful variation by Darwin for the origin of new species.
f) A colour blind son is born to normal parents. Explain with a cross
Answers
Answer:
a) Its reptilian characters are the presence of jawed teeth, clawed fingers, long tail with free caudal vertebrae and keel less sternum. The avian characters of Archaeopteryx are the presence of body feather, modification of forelimbs into wings, V-shaped furcula and bird like-girdle and limb bones.
b) Individual organisms carrying two identical alleles (for example RR or rr) are called as homozygous. While individual organisms bear different alleles (for example Rr) are called heterozygous.
c) Micropropagation is used to multiply plants such as those that have been genetically modified or bred through conventional plant breeding methods. The technique of micropropagation provides a good alternative for those plant species that show resistance to practices of conventional bulk propagation.
d) Mitosis is a type of cell division in which a eukaryotic cell separates the chromosomes into two identical sets and produces two daughter nuclei and then two daughter cells which are identical to parent cell while amitosis is a simple cell division process in which a simple cleavage of the nucleus occurs and produces
e) inheritance of such a characteristic means its reappearance in one or more individuals in the next or in succeeding generations. An example would be found in the supposed inheritance of a change brought about by the use and disuse of a special organ.
f) Colour blindness is a sex-linked disease. The gene for this disorder is present on the X chromosome. Hence, it is carried by normal females not expressing the disease. If a colour-blind child is born to a normal couple, then the mother would be the carrier of the disease.