16. Equalization of the amount of expression of X lnked genes in males and femal

Question

16. Equalization of the amount of expression of X lnked genes in males and females is accomplished via random X chromosome inactivation in females i all species. A) TRUE B) FALE who proposed the theory of chromosomal nondisjunction, was a student of A) Thomas Hunt Morgan; Calvin Bridges B) Thomas Hunt Morgan; Walter Sutton C) Reginald Punnett; Thomas Hunt Morgan D) Calvin Bridges; Walter Sutton E) Calvin Bridges; Thomas Hunt Morgan 18. The "father of fruit fly genetics" is A) Calvin Bridges B) Thomas Hunt Morgan C) Reginald Punnett D) Gregor Mendel E) Walter Sutton 19. The system for sex determination for bees, wasps, and ants is referred to asin which haploid generate gametes via while A) XX-XO; males; mitosis; females; meiosis B) haplodiploidy: females; mitosis; males; melosis C) xx-X0; females; mitosis; males; meiosis D) haplodiploidy; males; mitosis; females; meiosis E) none of the above generate gametes via 20. The X and Y chromosomes are able to pair up during Meiosis because of the presence of regions of homology on the 2 chromosomes known as . A) pseudohomologous regions B) pseudoautosomal regions C) heteroautosomal regions D) autohomologous regions E) The X and Y chromosomes do not pair up during Meiosis. proposed that Barr bodies were condensed inactivated X chromosomes and proposed that dosage compensation in mammals occurs via inactivation of a single X 21. A) Mary Lyon; Murray Barr B) Mary Lyon; Susumo Ohno C) Susumu Ohno; Mary Lyon D) Murray Barr; Mary Lyon E) Murray Barr; Susumu Ohno chromosome in females. 22. The SRY gene on the Y chromosome encodes the male hormone testosterone. A) TRUE B) FALSE 23. The greater degree of phenotypic variation in appearance observed in human females compared to males is explained in large part byA) genomic imprinting 8) incomplete dominance C] chromosomal nondisjunction D) genetic epistasis E) mosoaicism

Explanation / Answer

16. False. It is one of the mechanism for X linked gene expression equalization. It is observed in Mus musculus for example, but it is not true for all the species.

17. Option E

Calvin bridges performed chromosomal nondisjunction experiments in fruit flies as part of his thesis under the guidance of Thomas Hunt Morgan.

18. Thomas Hunt Morgan

19. Option D

20. Pseudoautosomal regions

21.option C

22. False. It codes for sex determining region Y protein.

23. Genomic imprinting

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