BIO201

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

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

C. _____ postulated the preformation theory.

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

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

F. ____________ is regarded as the father of Genetics.

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

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

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

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

K. 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?

L. ______ made an elaborate drawing of homunculus.

M. A genetic experiment involves a trihybrid cross : AaBbCc x AaBbCc. What is the number of genetic fusions?

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

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

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

Q. The diploid number of chromosomes in humans is _________

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

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

T. 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 __________

U. 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.

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

W. 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 _________

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

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

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

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

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

AC. _________ disproved the Hyppocrate’s theory.

AD. 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 ____.

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

AF. _________ advanced the theory of evolution.

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

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

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

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

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

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

AM. 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 _________

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

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

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

AQ. 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 _________

AR. 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?

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

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

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

AV. The following are true of genetics except ____.

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

AX. 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 ____.

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

AZ. 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 ____.

BA. The following are true of chromosomes except _____.

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

BC. Which of the following statements best describe aneuploidy?

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