Sex determination is the phenotypic establishment between males and females. The chromosomal determination of sex is based on the types of gametes produced by an organism. Linkage is the tendency of the genes present in the same chromosomes to stay together in heredity transmission. Linkage is an exception to independent assortment. For example - Genes of hemophilia are linked with the genes of color blindness and grey body. There are two types of linkage one is incomplete linkage and the other one is complete linkage. Complete linkage show only parental forms and not the recombinants. So, take this quiz and check your knowledge about sex determination gonochorism and linkage.
1. In heterogametic male condition, sex is determined.....
A. After fertilization
B. Before fertilization
C. At the time of fertilization
D. None of these
2. Sex of Drosophila is determined on the basis of ......
A. Only sex chromosome
B. Only number of chromosome
C. Only autosomes
D. Ratio of the number of X chromosome/haploid set of autosome
3. In Drosophila, sometimes flis have female in one part of the body and male in the other part of the body. This condition is called ......
A. Infrosome
B. Linkage value
C. Metasex
D. Gynandromorphs
4. The degree of intensity with which two genes are linked together is called .....
A. Linkage
B. Linkage gene
C. Linkage value
D. All of the above
5. Dorsophila always have _______ eyes.
A. Blue
B. Black
C. Pink
D. Red
6. How many types of linkage?
A. 5
B. 4
C. 2
D. 3
7. What kind of linkage in which the genes are present on a different chromosome or on the same chromosome?
A. Incomplete linkage
B. Complet linkage
C. Both of them
D. None of these
8. When the genes are located on the same chromosome then it is called .....
A. Incomplete linkage
B. Complete linkage
C. Pure linkage
D. All of these
9. How many linkage groups present in Drosophila?
A. 4
B. 6
C. 8
D. 10
10. How many linkage groups are present in Pisum sativum?
A. 4
B. 9
C. 2
D. 7
11. Linkage reduces the chances of formation of ........
A. Old tait
B. Copy of the trait
C. New trait
D. None of these
12. How many linkage groups are present in Zea mays?
A. 4
B. 23
C. 10
D. 7
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