Genetics Review: Meiosis, Alleles, and Dihybrid Crosses

What does heterozygous mean?

• An organism that has the same genes for a trait (TT or tt)
• An organism that has different genes for a trait (Tt)
• When neither gene is fully dominant; offspring is a mixture of both
• the different forms of a trait (hair color--> brown, blonde, red

In flowers, purple color is dominant to pink and short is dominant to tall. Cross a flower that is heterozygous for both traits with another flower that is pink and tall. What is the percentage of the flowers being pink and short?

• 75%
• 25%
• 4
• 1/2

What type of inheritance do two alleles have if their traits blend together? 

• Incomplete Dominance
• Co-Dominance
• Mendelian Inheritance
• Homozygous Inheritance

Which of the following means many genes?

• Codominance

• Multi-Genetics

• Polygenic

• Incomplete Dominance

This graphic shows an example of...

• Sex Linked Trait
• Complete Dominance
• Co-Dominance
• Incomplete Dominance

What type of "square" helps us solve genetic problems?

• carpenter square
• Mendel square
• Punnett square
• genetic square

Females-XX; MalesXY.  A couple has 4 girls.  What is the chance the next child will be a boy?

• 75%
• 100%
• 25%
• 50%

After meiosis II the daughter cells will contain ____ chromosomes if the original cell contained 78.

• 78
• 39
• 23
• 46

Which of the following cells is a gamete?

• egg
• bone
• heart
• muscle

The pair of chromosomes that contain the same genes (but may be coded differently) and are inherited from a male and female parent are termed ___.

• gametes
• alleles
• zygote
• homologs