Grade 10 Biology Exam 4 Prep

Genetics is the area of study dealing with biological heredity.

• True

• False

The frequency of crossing over decreases with the distance separating genes on a chromosome.

• True

• False

Codominant alleles are expressed equally.

• True

• False

Under normal rules of dominance, if 2 different alleles are present, the dominant allele is expressed.

• True

• False

Crossing Over is one of the sources of genetic variation.

• True

• False

A mutagen is a substance that causes a change in DNA.

• True

• False

Replace the underlined word with one that will make the sentence true:

Mitosis is a kind of cell division that produces the sex cells, the egg and the sperm.

• Meiosis

• Cytosine

• Sex Chromosomes

• Heterozygous

Replace the underlined word with one that will make the sentence true:

In DNA, the base Adenine (A) pairs with Guanine (G).

• Meiosis

• Cytosine

• Sex Chromosomes

• Heterozygous

Replace the underlined word with one that will make the sentence true:

In humans, sex is determined by the autosomes.

• Meiosis

• Cytosine

• Sex Chromosomes

• Heterozygous

Replace the underlined word with one that will make the sentence true:

An organism that has the genetic makeup of Tt is said to be homozygous.

• Meiosis

• Cytosine

• Sex Chromosomes

• Heterozygous