All males are infertile and females have reduced fertility. The 16 cell stage of the mouse. A Preodontoblasts B Odontoblasts C Epithelial rests of Malassez D Epithelial diaphragm E Epithelial rests of Serres Ans: C 33: Source of the epithelium of odontogenic cysts is? Some of these proliferating cells are called the Head Process , which forms the notochord. This change can be traced to a tiny mutation in a single gene on chromosome 12. A Initiation B Bud stage C Cap stage D Bell stage E Appositional stage Ans: E 28: Enamel dysplasia, concrescence, and enamel pearls occur when there is defect in whch stage of tooth development? Sperm cells produce pollen tubes and enter into female gametophyte. It is not at all hereditary.
A 2 weeks B 4 weeks C 6 weeks D 5 weeks E 7 weeks Ans: C. As found out by Ingram 1958 , haemoglobin-S differs from normal haemoglobin-A in only one amino acid — 6th amino acid of P-chain, glutamic acid, is replaced by valine. This is a serious problem. To reduce the number to haploid in the resulting daughter cells D. A Enamel Pearls B Enamel Knot C Enamel Organ D Dental Lamina E Dental Follicle Ans: E. . Thus the gene is dominant and expresses even in heterozygous condition.
These structures are not present in non-viviparous organisms. This is a target blocked by nanos. A small gene pool C. When this happens Bicoid up-regulates the production of hunchback. A Initiation B Bud stage C Cap stage D Bell stage E Appositional stage Ans: E 26: The dental papilla begins to form pulp tissue in which stage of tooth development? Both sickle-cell anaemia and thalassemia are more common in malaria areas, because these mutations convey some protection against the parasite. Such females are known as carriers. As of Feb 07 19.
This is called erythroblastosis foetalis. So check each option which one best works. It is also the first syndrome to be described in humans. Can occur if the cells aren't lined up in the middle of the cell during division, it causes the cytoplasm to be pulled in a funny way and causes the cytoplasm to not be evenly distributed. Steward was successful through this experiment.
First the zygote is formed via fertilization between the gametes. Holandric genes are directly inherited by a son from his father. The more the X chromosomes, the greater is the mental defect. It is perhaps the smallest gene occupying only 14 base pairs. It is the second most common extra chromosome condition, and is named after Dr.
A Initiation B Bud stage C Cap stage D Bell stage E Appositional stage Ans: C. Haemophilia is a sex linked recessive trait. Areas of particular emphasis include transcriptional control mechanisms, embryonic patterning, cell-cell. To produce genetically identical daughter cells B. For a gene to be conserved it means that the gene does not evolve it is genetically unchanged across species.
Following much maturation, becomes an adult 4. Erythroblastosis foetalis is caused when fertilization takes place between gametes of a Rh female and Rh + male b Rh + female and Rh — male c Rh + female and Rh + male d Rh~ female and Rh — male. Others who do not have this factor are known as Rh negative Rh —. Homologous regions of the two help in pairing. The disorder or disease is caused by the formation of an abnormal haemoglobin called haemoglobin-S. It will later form the brain and spinal cord of the animal. To reduce the chromosome number to haploid in the resulting daughter cells 4.
During the transcription of a certain protein, an extra cytosine was placed into a gene region, throwing off the correct amino acid sequence. A Initiation B Bud stage C Cap stage D Bell stage E Appositional stage Ans: A. Haemophilia A is the most common X-linked genetic disease that prevents normal blood clotting when blood vessels are ruptured. This was proven through an experiment done by Steward. On the other hand, the mosquito borne disease is malaria. Cactus leads to a ventralized mutant.