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Heredity and variation
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Avg score: 11% • Most missed: “Genes located on Y-chromosome are[1994]”
Heredity and variation
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25 Questions

1. An allele is dominant if it isexpressed in [1992]
2. Two crosses between the same pairof genotypes or phenotypes in which thesource of the gametes are reversed inone cross - is known as [2003]
3. Cross between AaBB and aaBB willform [1990]
4. Nucleosome core is made of [1993]
5. Molecular weight of chromosome ofyeast cell is [1999]
6. H.J.Muller was awarded Nobel Prizefor his [1996]
7. Mutations used in agriculture arecommonly
8. A common test to find thegenotype of a hybrid is by [2007]
9. Sickle cell anaemia has not beeneliminated from the African populationbecause [2006]
10. Genes located on Y-chromosome are[1994]
11. Alleles that produce independenteffects in their heterozygous conditionare called
12. Which one of the followingconditions in humans. is correctlymatchedwithitschromosomalabnormality/linkage? [2008]284
13. A fruitfly exhibiting both male andfemale traits is [1994]
14. A fruit fly is heterozygous for sexlinked genes. When mated with a normalfemale fruit fly - the male-specificchromosome will enter egg cells in theproportion of [1997]
15. Albinism is known to be due to anautosomal recessive mutation. The firstchild of a couple with normal skinpigmentation was an albino. What is theprobability that their second child willalso be an albino? [1998]
16. .InDrosophila - thesexisdetermined by [2003]
17. The linkage map of X-chromosomeof fruit fly has 66 units - with yellowbody gene (y) at one end and bobbed hair
18. Which one is a hereditary disease?[1990]
19. ABO blood group system is due to[1990]
20. A mother in a family of five daughtersis expecting her sixth baby. The chanceof its being a son is [1988]
21. A colour blind mother and normalfather would have [1992 - 94]
22. Of both normal parents - the chanceof a male child becoming colour blindare [1993]
23. Inheritances of skin colour inhumans is an example of [2007]
24. Which of the following is suitable forexperiment on linkage [1993]
25. Haemophilia is more commonlyseen in human males than in humanfemales because: [2005]

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