Question

1.) Which of the following is not a base found in DNA?

Uracil, Guanine, Thymine, Adenine.

2.) short lengths od DNA are wound around bundles of BLANK to create a structure consisting of many nucleosomes strung together by strings of DNA.

3.) Which of the following statements regarding genes is NOT true.

Genes are the basic unit of information affrcting a genetic trait, Genes cinsist of a long sequence of DNA, Genes are found as single copies in cells other than sperm or egg, Genes are located on chromosomes.

4.) An allele that i not expressed in heterozygous carriers is called a(n) BLANK allele.

5.) An individual who has the same genotype X^N X^n for the night blindness is considered a Blank for night blindness.

Answer 1

1. DNA contains four bases.
Purines = Guanine and Adenine
Pyrimidines = Cytosine and Thymine
DNA does not contain Uracil.

2. Short lengths od DNA are wound around bundles of HISTONE CORE OCTAMER to create a structure consisting of many nucleosomes strung together by strings of DNA.
~200 bp DNA is wrapped twice around the histone core octamer composed of two copies of each H2A, H2B, H3, and H4 histones.
The linker DNA contains H1 histone.

3. Option C is correct
Vegetative cells are diploid
i.e. They contain two copies of genes.

4. An allele that is not expressed in heterozygous carriers is called a RECESSIVE allele.
A recessive allele is expressed only in the homozygous condition.

5. An individual who has the same genotype X^N Xⁿ for the night blindness is considered a CARRIER for night blindness.
Carrier = A person who contains the defective allele but does not exhibit the disease.