Monohybrid and Dihybrid Crosses

If a pea plant has one recessive allele for green peas, what conditions will allow for the green phenotype to appear?

• Green peas will only appear if the dominant yellow allele is present

• Green peas will always appear regardless of the other allele

• Green peas will only appear if the dominant yellow allele is not present

• Green peas will never appear regardless of the other allele

Gregor mendel crossed true-breeding purple flowered plants with true-breeding white flowered plants. All of the offspring were purple. What is the best explanation for this?

• The allele for purple flowered plants is recessive

• The allele for white flowered plants is dominant

• The allele for purple flowered plants is dominant

• They were homozygous like their parents

Genotype refers to the ...

• physical expression of the genes

• the possible combination of alleles in a gene

• whether an allele is dominant or recessive

• how an organism will appear

An offspring will receive how many alleles from each parent to determine a specific trait?

• one

• two

• three

• five

Tags

NGSS.HS-LS3-1

In certain species of roses, white roses and red roses are incompletely dominant to each other. When a red rose and a white rose are crossed, a pink rose is produced. What is the probability of producing a white rose when a red rose is crossed with a pink rose?

• 100%

• 75%

• 25%

• 0%

What is the genotypic ratio of the offspring?

• 3 AA : 1 aa

• 1 AA : 3 aa

• 1 AA : 2 Aa : 1 aa

• 2 AA : 2 aa

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What allele combination should go in the missing box?

• AA

• Aa

• aa

• none of these

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following genotypes is a purebred?

• Bb

• Gg

• bb

• Dd

Which of the following alleles is homozygous recessive?

• Tt

• tt

• TT

• T

Brown (B) is dominant over white (b). Which genotype is a purebred for brown fur?

• BB

• Bb

• bb

• All of the above