Which term describes a type of trait that is usually expressed only when an organism has two identical alleles for the trait?
A- homozygous
B- dominant
C- heterozygous
D- recessive
My guess is A.
I meant that my choice is A.
The definition of homozygous is having two identical alleles for a gene being considered.
So the correct answer is A?
Yes.
Thank you! :)
You're welcome.
Which term describes one type of organism?
A. species
B. domain
C. family
D. genus
A. species.
Your guess is correct! The term that describes a type of trait that is usually expressed only when an organism has two identical alleles for the trait is A - homozygous.
To understand why, let's break down the options and their meanings:
A- Homozygous: This term refers to a condition where an organism has two identical alleles for a particular trait. For example, if an organism has two alleles for eye color, both of which code for blue eyes, it would be homozygous for the blue eye color trait.
B- Dominant: A dominant trait is a characteristic that is expressed when at least one copy of the associated allele is present. If an organism is heterozygous (has two different alleles) for a trait, and one of the alleles is dominant, the dominant trait will be expressed.
C- Heterozygous: This term describes a condition in which an organism has two different alleles for a particular trait. For example, if an organism has one allele for brown eyes and one allele for blue eyes, it would be heterozygous for the eye color trait.
D- Recessive: A recessive trait is a characteristic that is only expressed when two copies of the associated allele are present. If an organism is homozygous for a recessive trait, meaning it has two copies of the recessive allele, the recessive trait will be expressed.
In this case, option A - homozygous is the correct term because the statement mentions "only when an organism has two identical alleles for the trait." This condition is fulfilled by homozygous organisms.