1.TF Genetics is the area of study dealing with biological heredity 2 TFCrossing

Question

1.TF Genetics is the area of study dealing with biological heredity 2 TFCrossing over is the only source of genetic variation. 3. (TD F Meiosis divides the nuclear material of a cell to produce the sex cells egg and 4. T F An organism that has the genetic makeup of TT is said to be heterozygous. sperm. T F In DNA, the base thymine (T) pairs with cytosine (C) 6. T 7. F In a human cell, the majority of chromosomes are sex chromosomes Under normal rules of dominance, if two different alleles are present, the recessive allele is expressed. TF 8. T F A mutagen is a substance that can cause a change in DNA 9. TF The frequency of crossing over increases with the distance separating genes on a chromosome. 10. TFCodominant alleles are equally expressed. For each of the following, write on the blank line the letter of the word or phrase that best completes the statement or answers the question. A DNA nucleotide does not contain (A) adenine. (B) cytosine. (C) thymine.D) Dracil. 12. Human blood type is determined by (A) multiple alleles. (C) podominant alleles. (B) sex-linked genes (D) a dominant allele. continue American School Lansing, IL A-(2341)-06/15-01

Explanation / Answer

All the marked answers so far are correct

5.False. Thymine pairs with Adenine and Cytosine wih Adenine.

6.False. In a human cell the majority of chromosomes are autosomes. We have 23 pairs or 46 number of chromosomes, of which 22 pairs or 44 chromosomes are autosomes and 1 pair or 2 chromosomes are sex chromosomes.

7. True

8. True.

9. True

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