Genetics

The observable physical characteristics of a trait.  

• Genotype
• allele
• Phenotype
• Heterozygous

The single version of a gene.

• Allele
• Phenotype
• Genotype
• Heterozygous

When you have two different alleles, the genotype is said to be _____.

• Homozygous dominant
• Homozygous recessive
• Heterozgyous
• none of the above

In the heterzygous form, the _____ allele is expressed

• Dominant
• Recessive
• neither allele
• both alleles

When an area of a chromatid is exchanged with the matching area on a chromatid of its homologous chromosome, _________________ occurs

• crossing over
• mutagenesis
• hybridization
• fertilization

The ________ produced by each parent are shown along the side of a Punnet Square.

• zygotes
• offspring
• gametes
• hybrids

A useful device for predicting the possible offspring of crosses between genotypes is the 

• Law of dominance
• Law of independent assorment
• Punnett Square
• testcross

Which of the following describes an organism that has the genotype Bb.

• homozygous
• heterozygous
• inbred
• all of these

A couple has two children, both of whom are boys.  What is the chance that the parent's next child will be a boy?

• 0%
• 25%
• 50%
• 75%

Meiosis in humans produces cells with how many chromosomes?

• 44
• 22
• 46
• 23