BIO201

1. In human males, the sex chromosomal constitution is _________

2. Two individuals heterozygous at certain loci are crossed, given that the number of loci = n, an expression that represent the number of different types of gametic fusion is given by _________

3. The division of chromosomes in mitosis as well as their constancy was described by _____.

4. The performation theory postulated that a miniature human being called a ___________ is present in the sperm.

5. If two coins are thrown simultaneously, what is the probability that the first coin will be head and the second tail?

6. The diploid number of chromosomes in humans is _________

7. The following are patterns of sex chromosome distribution except _____.

8. One of the most clear – cut piece of evidence ilIustrating sex – linked inheritance was reported by ___________

9. What is the probability that if a farmer would put his hand in a bowl containing the red seeds from a bowl containing a cross of Rr X Rr, he would pick up a seed which is Rr in genotype?

10. Who advanced the theory that the cell nucleus must contain the hereditry materials? I. Strasburger, II. Edward van benden, III. Hertrig , IV. Roux

11. Albinism is an autosomal trait in human. The allelic symbol ‘a’ of an albino shows that the genotype is __________

12. _________ advanced the theory of evolution.

13. The following are true of genetics except ____.

14. The most prominent adherent to the inheritance of acquired characteristics in recent times was ________

15. What is the probability that the first child of Aa x aa parents will have a recessive genotype?

16. Genes in the X-chromosome forming the barr body is __________

17. A condition in which more than one sperm fertilizes an egg is called __________

18. A phenomenon whereby the gene for a trait is located on the X or Y chromosome is known as ________

19. Albinism is an autosomal trait in human. The allelic symbol ( A ) is for __________

20. In drosophila, non-disjunction cannot occur between ____.

21. In which of the following sex abnormallies in man are those affected recognized as females but are poorly developed?

22. _____ provided the most convincing proof of the theory that genes are on chromosomes.

23. If a farmer put his hand in a bowl containing the red seeds from a cross of Rr x Rr, what is the probability that he would pick a seed which is RR in genotype?

24. The sex which has only one X or Z chromosome is described as being _________

25. In a heterozygote, the allele that is not expressed is the ________ allele

26. A sex abnormally in man in which the affected females are shorter than average, have webbing of the neck, and mentally retarded is known as ____.

27. In sex determination system, an XXY individual is phenotypically a ________

28. The observable characteristics of an organism is referred to as the ________

29. Where a gene is not sex – linked, it must therefore be __________

30. In order to have four toes in guinea pugs, there must be at least ____________ contributing alleles present

31. ____________ is regarded as the father of Genetics.

32. The symbols used to represent the alleles of genotypes of an individual are called __________

33. In Nilsson- Ehle’s work with the colour of wheat kernel, a cross between pure breeding dark red-kerneled and white kernel parents were all of intermediate red colour. In the F2 generation however, one- sixteenth of the progeny has the same dark red colour of the Pgeneration parents. This shows that the trait is controlled by ____.

34. _________ disproved the Hyppocrate’s theory.

35. If the genes for a trait occur in both sexes, but the expression of the trait is different in the sexes, the trait is said to be __________

36. Genes located on the Y chromosome can specifically be referred to as __________ genes.

37. A cross in which the traits of the male and the female are reversed is known as a ___________ cross.

38. A genetic experiment involves a trihybrid cross : AaBbCc x AaBbCc. How many genes are involved in this experiment?

39. The following statements are pararallel between the genetics and cytological facts that form the basis of the chromosome theory except ____.

40. _____ postulated the preformation theory.

41. In sex determination system, an XO individual is phenotypically a _________

42. The following are true of chromosomes except _____.

43. In Mendel’s experiment on garden peas, tall ( TT ) in dominant over dwarf ( t ). In a TT x tt cross, the chances of obtaining a tall plant is _________

44. A situation in which alleles of one gene separate into gametes randomly with respect to the alleles of other genes refers to the law of _________

45. In a genetic cross, the parents are symbolized P while the second generation is symbolized as __________

46. According to Darwin, exact miniature replicas called ________ of the body parts and organs are carried in the blood stream to be assembled in the gametes.

47. Which of the following statements best describe aneuploidy?

48. ______ made an elaborate drawing of homunculus.

49. A cross between a male chicken and a normal female which results in two female to one male instead of the expected 1:1 ratio among progeny of this cross is a proof that the male has a chromosomal constitution of ____.

50. Whose theory stated that “small representative of all parts of the parental body are concentrated in the semen”?