Genetics Practice

The instruction of one allele covers up the instruction

of the other allele in a homologous pair. Symbolized by a capital letter.

• Recessive Allele

• Dominant Allele

• Heredity

• Trait

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the percentage of homozygous recessive offspring?

• 0%
• 25%
• 50%
• 75%

Tags

NGSS.HS-LS3-3

Green peas are dominant (G) to yellow peas (g). What is the genotype for a hetereozygous dominant offspring?

• Gg
• gg
• GG

Tags

NGSS.HS-LS3-1

In Mendel's pea plants, the homozygous recessive phenotype was white flowers.  If Mendel crossed two homozygous recessive pea plants, what color flowers would be seen in the offspring?

• white and purple
• white 
• purple
• lavendar

What percentage of the offspring will be purebred dominant?

• 0%
• 25%
• 50%
• 75%

Tags

NGSS.HS-LS3-3

Dominant alleles are represented by a(n)

• phenotype
• lower case letter
• upper case letter
• punnett square 

True or False:
A heterozygous dominant trait can be written as BB.

• True
• False

D = dimples        d = no dimples 
What is the genotype for a homozygous recessive offspring?

• DD
• Dd
• dd

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If two purebred species (BB) are crossed, what percentage of their offspring would be BB?

• 25%
• 50%
• 75%
• 100%

Tags

NGSS.HS-LS3-2

What do you call the physical expression of a gene?

• genotype
• dominant
• phenotype
• allele

Tags

NGSS.HS-LS1-1