Which Statement or Factor Is a Criterion for Autosomal-Recessive Transmission

question 28

Multiple Choice

Which statement or factor is a criterion for autosomal-recessive transmission of single-gene traits?

• A)About 25% of the members of a large kindred with an autosomal-recessive trait will express the trait.
• B)There is no carrier status; if the allele for the trait is present, it is expressed, although the degree of expression can be variable.
• C)Individuals who are heterozygous for an autosomal-recessive trait have minimal risk for transmitting the allele to their offspring.
• D)The degree of expression of an autosomal-recessive trait or disorder in a homozygous individual is directly related to the penetrance of the trait.

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Definitions:

Covalent Bond

Chemical bond in which atoms share one pair of electrons.

Ionic Compounds

Chemical compounds composed of ions held together by electrostatic forces termed ionic bonding, typically formed between metals and non-metals.

Transfer of Electrons

A fundamental process in chemistry where electrons move from one atom, ion, or molecule to another, driving various chemical reactions and energy production.

Neutrons

Subatomic particles found in the nucleus of an atom, having no electrical charge and a mass slightly greater than that of protons.