Genetics 3/2

G = green, g = yellow
The genotype for a yellow plant is...

• GG
• Gg
• gg
• all of the choices result in yellow

Which of the following is homozygous dominant?

• Yy
• Y
• yy
• YY

The exact genetic makeup of an organism, such as RR, Tt, PP is its?

• phenotype
• dominance
• genotype
• trait

Genotype or Phenotype: Black hair

• Phenotype

• Genotype

tt, small letters are ______

• DNA

• dominant

• recessive

Red (R) is dominant over white (r). How can a flower be white?

• It can have RR and be white.

• It has to have rr.

• It has to have rR

• There is no way it can be white until the third generation.

A single cross such as flower color, is call

• monohybrid

• crossing over

• dihybrid

• homozygous

How many chromosomes are in a normal human body cell?

• 23
• 46
• 92

Green flowers are dominant to yellow flowers. If the parents (GG and gg) are crossed, what percentage of the offspring will have green flowers?

• 100%

• 75%

• 50%

• 25%

• 0%

Blue flowers (GG) are incompletely dominant to Yellow flowers (gg). If two Green parents (Gg x Gg) are crossed, what percentage of their offspring will be Yellow flowers?

• 100%

• 75%

• 50%

• 25%

• 0%