Chapter 6 Test Review

How many chromosomes are in each human sex cell?

• 20
• 23
• 46
• 78

Before Mendel's experiments about heredity, people explained how traits came from both parents with the idea of

• proportionate inheritance
• mixed inheritance
• blending inheritance
• Mendelian inheritance

Which of the following traits are influenced by more than one gene?

• fur color in a white tiger
• the shades of human eye colors
• whether a pea seed is wrinkled or smooth
• whether a pea flower is purple or white

What an organism looks like, or other detectable characteristics, is its

• genetic variable
• genotype
• phenotype
• allele

What chromosomes carry the same set of genes, although they may have different alleles for each gene?

• twin chromosomes
• homologous chromosomes
• ordinary chromosomes
• asexual chromosomes

What is a feature that has different forms in a population?

• cell
• characteristic
• nuclear membrane
• trait

Some grasshoppers that eat certain plants develop yellow and black coloration because their environment influences their

• genotype
• phenotype
• chromosomes
• DNA

What is one internal environmental condition that can influence a person's height?

• sunlight
• genotype
• age
• nutrition

What is the Punnett square used to predict?

• possible genotypes for the cross
• which traits are dominant
• which traits are recessive
• the number of offspring

If P is a dominant allele for purple flowers and p is a recessive allele for white flowers, what are the phenotypes for this cross?

• four purple flowers
• four white flowers
• two purple flowers and two white flowers
• three purple flowers and one white flower