Unit 9- Genetics Review

AA and Aa always show up as

• dominant
• recessive

Aa, DD, bB, yy are all examples of

• genotypes
• phenotypes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following genotypes is homozygous dominant?

• A
• Aa
• AA
• aa

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

Tags

NGSS.HS-LS3-1

What ratio of the offspring from the cross shown will be homozygous recessive for the  trait of tallness? 

• 0 in 4
• 1 in 4
• 2 in 4
• 4 in 4

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Straight hair is dominant to curly hair.
Which parents will give a 25% chance of having offspring with curly hair?

• 2 heterozygous straight hair (Tt)
• 2 homozygous straight hair (TT)
• 1 homzygous curly (tt) and 1 homzygous straight (TT)
• 1 heterozygous straight (Tt) and 1 homozgyous curly (tt) 

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.

• they have same phenotype and genotype
• they have different genotypes and phenotypes
• they have same phenotype but different genotypes
• they have same genotype but different phenotypes

In sheep, the allele for belly fur (A) is dominant to the allele for no belly fur (a). A Two heterozygous individuals are crossed. What is the percent chance that the offspring will have NO belly fur?

• 100%
• 75%
• 50%
• 25%

In mussels, brown coloring (B) is dominant, and blue coloring (b) is recessive.A homozygous brown mussel crosses with a blue mussel.What percentage of offspring are expected to be blue?

• 25%
• 75%
• 50%
• 0%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If butterflies can have straight or curly antennae, and curly is recessive; what is the possibility (using %'age) that a pure breeding straight is crossed with a hybrid straight, will have offspring with straight antennae?

• 25%
• 50%
• 75%
• 100%