1.What are the different forms of chromosomal sex determination? Is gender in al

Question

1.What are the different forms of chromosomal sex determination? Is gender in all species determined by sex chromosomes? What are the alternatives? What is meant by “sequential hermaphroditism”?

2.What region of the Y chromosome is necessary for them to assemble together during meiosis? What region is responsible for male characteristics?

3.In what model organism was genetic linkage first studied? Who created the first linkage map? Approximately when was linkage first studied?

4.What is self-incompatibility? What function does it serve? You should understand that self-incompatibility, like the ABO blood type gene, is an example of a gene with multiple alleles and codominance.

Explanation / Answer

There are three main types of sex chromosomal determination. In mammals and other primates XX-XY SEX Determination in worms XX-X0 sex determination and in reptiles ZW-ZZ sex determination. In addition to chromosonal sex determination sex can also affected by environmental condition like temperature.

2. Pseudoautosomal genes are necessary for assembly and segrigation and SRY (sex determining Y region) is necessary to determine male sex.

3. Modal organism for genetic linkage is Drossophilla melanogastor and First linkage map was made by Alfred Sturtevant in 1913. Linkage was firstly studied in 1905

4 self incompatibility is the process which prevent inbreeding and promotes cross pollination in flowering plants mainly. Blood type is coded by three type of alleles IA IB and i and they show codominance.

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