BIO201

1. ______ made an elaborate drawing of homunculus.

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

3. 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 ____.

4. Boveri was able to show that the abnormal development of a dispermic embryo was the result of the __________ chromosome distribution.

5. The stage at which chromosomes move to the opposite poles during cell division is called __________

6. ____________ is regarded as the father of Genetics.

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

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

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

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

11. A cross between an offspring and one of its parents is known as a ____________

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

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

14. The following are true of genetics except ____.

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

16. _____ postulated the preformation theory.

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

18. 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 _________

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

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

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

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

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

24. _________ advanced the theory of evolution.

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

26. The following are true of chromosomes except _____.

27. 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 ____.

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

29. Which of the following statements best describe aneuploidy?

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

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

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

33. 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 _________

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

35. _________ disproved the Hyppocrate’s theory.

36. 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 ____.

37. 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.

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

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

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

41. 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?

42. The diploid number of chromosomes in humans is _________

43. 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 _________

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

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

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

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

48. An individual having two unidentical alleles of a given gene is said to be _________ for that gene.

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

50. It is assumed that skin colour in man is determined by a maximum of _________ additive loci.