Genetics Review

Of 12 hamsters just born, 9 have brown fur and 3 have white fur. The trait for white fur is considered to be ________.

• recessive
• weak
• strong
• dominant

 When the genotype consists of a dominant and a recessive allele, the phenotype will be like the ______________ allele.

• dominant
• recessive
• both
• neither

 Which of these would best be described as a phenotype?

• blue eyes
• mutation
• Bb
• Tt

 A pea plant is heterozygous for height (Tt) and it is crossed with a homozygous short (tt) plant. Use a Punnett square to determine the probability of one of their offspring being short.

• 100%
• 75%%
• 50%
• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

 One dog carries homozygous, long-haired traits (SS), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having long hair.

• 100%
• 75%
• 50%
• 25%

Tags

NGSS.HS-LS3-3

How many females are in this pedigree? Circles are females and squares are males.

• 3

• 4

• 6

• 7

How many males are there in this pedigree chart? Females are circles and males are squares.

• 2

• 3

• 4

• 6

 Look at the Punnett square. If the two parents represented in the Punnett square have four offspring, what does the Punnett square tells you?

• two of the offspring will definitely be heterozygous.  
• one of the offspring will definitely show the recessive trait.
• there is a 50% chance for each of the 4 offspring to have the genotype Rr.
• there is a greater chance for the offspring to be RR than rr.

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

TT

• Homozygous

• Heterozygous

Tags

NGSS.HS-LS3-1

tt

• Homozygous

• Heterozygous

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2