In a Flowering Plant,gene "A" Encodes an Enzyme Responsible for the Presence

question 45

Multiple Choice

In a flowering plant,gene "A" encodes an enzyme responsible for the presence of dots on the flowers' petals.A₁,A₂,and A₃ are the three known alleles of this gene;A₁ is the wild type,A₂ is a null allele,while A₃ has a mutation in the promoter region of the gene,which results in the synthesis of very little gene product. If the "A" gene is haploinsufficient,what is the predicted phenotypic ratio in the F₁ of a cross between a wild type and a A₂/A₃ heterozygous?

• A)100% of the F₁ plants will have flowers with dots.
• B)25% of the F₁ plants will have flowers with dots,and 75% will have flowers with no dots.
• C)50% of the F₁ plants will have flowers with dots,and 50% will have flowers with no dots.
• D)50% of the F₁ plants will have flowers with a few dots,25% will have flowers with normal amounts of dots,and 25% will have flowers with no dots.
• E)100% of the F₁ plants will have flowers with no dots.

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Definitions:

Interdependence

A mutual reliance between two or more groups or people, where each is dependent on the others for certain needs or outcomes.

Mental Health

Narrowly, the absence of disorder. In a broader view, the presence of optimal social, emotional, and cognitive functioning—also known as wellness.

General Risk Factors

Conditions or variables associated with an increased likelihood of developing a disorder, illness, or other negative outcomes.

Vulnerable

Capable of being physically or emotionally wounded or open to attack or damage.