Chapter 12 Intro to Genetics

The principle of dominance states that

• all alleles are dominant

• some alleles are dominant and others are recessive

• all alleles are recessive

• alleles are neither dominant nor recessive.

Gametes have

• The same number of chromosomes as body cells

• twice the number of chromosomes found in body cells

• two copies of chromosomes.

• one copy of each chromosome

Gametes are produced by the process of

• mitosis

• meiosis

• crossing-over.

• replication

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In humans, a male has

• one X chromosome only

• one X chromosome and one Y chromosome

• two X chromosomes

• two Y chromosomes

Different alleles in a population contribute to

• extinction

• diversity

• mutations

• population control

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The physical characteristics of an organism are its

• phenotype

• genetics

• Heredity

• Genotype

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Unlike mitosis, meiosis results in the formation of

• two genetically identical cells

• four genetically identical cells.

• four genetically different cells.

• two genetically different cells.

If an organism’s diploid number is 24, its haploid number is

• 6

• 12

• 24

• 3

The different forms of a gene are called ___.

• traits

• homologous chromosomes

• alleles

• Characters

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Organisms that have two identical alleles for a particular trait are said to be

• Hybrid

• homozygous.

• heterozygous

• Dominant.