Genetics Review

Color blindness is a recessive X linked trait.  A woman that is a carrier for color blindness marries a man that has normal vision.  What are the chances of this couple having a child born with the color blind trait.  

• 0%
• 25%
• 50%
• 100%

Which of the following is a phenotype?

• BB
• Bb
• bb
• Blue eyes

having two of the same genes for the trait (sometimes called purebred).

• homozygous
• hetrozygous
• protein
• chromosome

Tags

NGSS.HS-LS3-1

having two different genes for a trait (sometimes called hybrid).

• protein
• homozygous
• heterozygous
• genotype

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %
• 25%
• 50%
• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

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

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

Tags

NGSS.HS-LS3-1

An allele whose trait only shows up when no dominant allele is present.

• hidden allele
• dominant allele
• recessive allele
• present allele

What is the definition of phenotype?

• The physical expression of a trait
• The genetic combination of alleles
• A gene on the DNA strand

Tags

NGSS.HS-LS3-1

What is the definition of genotype?

• The physical expression of a trait
• The genetic combination of alleles 
• the genes on a DNA strand

Tags

NGSS.HS-LS3-1

Almond eyes (A) are dominant to round (a) and Brown eyes (B) are dominant to blue (b).  A man with round blue eyes marries a woman that is homozygous for almond and Brown eyes.   What are the chances of this couple having a child with Almond shaped brown eyes?

• 0%
• 25%
• 50%
• 100%