1. A colorblind woman marries a normal man. Which of the following is true of th

Question

1. A colorblind woman marries a normal man. Which of the following is true of their children?
a. all will be colorblind
b. all daughters will be normal and all sons will be carriers
c. all daughters will be colorblind and all sons will be normal
d. all daughters will be heterozygous and all sons will be colorblind
e. it is impossible to predict with any reasonable degree of certainty

2. Cleft chin is an autosomal dominant trait. A man with a cleft chin marries a woman with a round chin. What proportion of their female progeny will show the trait?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%

3. Which of the following statements is false?
a. individuals with the same phenotype might have different genotypes
b. matings between individuals with dominant phenotypes cannot produce offspring with recessive phenotypes
c. matings between individuals with recessive phenotypes usually do not produce offspring with dominant phenotypes
d. individuals with the same genotype might have different phenotypes.
e. all the above are correct choices

4. True or False
a. DNA is composed of 4 different types of nucleotides T/F?
b. in the DNA of every species, the amount of adenine present always equals the amount of thymine, and the amount of cytosine always equals the amount of guanine T/F?
c. in a nucleotide, the phosphate group is attached to the nitrogen-containing base, which is attached to the 5 carbon sugar T/F?
d. Watson and Crick built their model of DNA in the early 1950s T/F

5. MATCHING - each choice can be used more than once.
a. ribosomal RNA
b. DNA
c. mRNA
d. tRNA
e. RNA polymerase
-carries the genetic code sequence
-joins up with amino acids
-attaches the specific amino acids
-contains no uracil
-has anticodons
-determines amino acid sequence
-reads the codons
-contains codons
-has 2 polynucleotide chains
-has deoxyribose sugar
-makes RNA molecules in the nucleus

6. The number of base pairs in the human genome is about:
a. 1 million
b. 1 trillion
c. 10 billion
d. 75 billion

7. Pyrimidines are
a. single ringed
b. triple ringed
c. double ringed
d. none of these

8. Adenine is
a. double ringed
b. single ringed
c. a straight up chained carbon compound
d. a phospholipid

9._______ is the enzyme which puts together the correct DNA base sequence
a. DNA polymerase
b. RNA polymerase
c. helicase
d. adenine

Explanation / Answer

1)colour blindness is X-linked inheritance mother transmits one X chromosome to each her sons and daughters. Hence it the mother is colour blind she is homozygous. For it is the recessive gene that causes the abnormality. Thus all her sons who receive the X chromosome are colour blind as the son has only one X chromosome.

2) 100%

3)(e) All the above correct choice

4) a) DNA is composed of 4 different types of nucleotides,(ATP,GTP,CTP,TTP)(True)

    b) A=T, G-=( 3 hydrogen bonds)c 1:1 chargaff rule(True)

    c) nucleotide=nitrogenbase+ sugar+phosphate

    d) 1950 s the DNA has double helical structure proposed by Watson and crick

5) a) ribosomal RNA- has two p;olynuleotide chains (16S rRNA,5s rRNA)

     b)DNA-has deoxyribose sugar, arries up the genetic code sequence)

     c) mRNA- contains condons

     d)tRNA- joins up with aminoacids, has anticodons

     e)RNA polymerase- makes RNA molecule in the nucleus

6)23 pairs (3 billion base pairs)

7)pyrimidines are single ringed

8) Adinine double ring(Purine)

9)DNA polymerase has proof reading activity

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