Which of the following is true of a parasitic relationship?
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The parasite benefits, and the host is harmed; however, the host is not generally killed.
The parasite benefits, and the host is killed.
The parasite benefits for a time; however, both the parasite and the host eventually die as a result of the relationship.
The host benefits from the relationship, and the parasite is harmed.
The parasite benefits, and the host is harmed; however, the host is not generally killed.
Both of Tim's parents have brown eyes, but Tim has blue eyes. How is this possible?
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The characteristic (blue eyes) is carried in a recessive gene.
This characteristic (blue eyes) must be carried in the dominant gene.
Eye color is not a genetic trait.
all of these
The characteristic (blue eyes) is carried in a recessive gene.
A widow's peak is a V-shaped area of the hairline in the center of the forehead. The allele for having a widow's peak is dominant to the allele for not having a widow's peak.If two parents do not have widow's peaks, what is the probability that their child will have a widow's peak?
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75%
50%
25%
0
25%
An organism that contains two different alleles for a trait is said to be _______ for that trait.
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recessive
heterozygous
dominant
homozygous
heterozygous
Which of the following is true about genes?
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Genes are responsible for all the traits of an organism.
In humans, genes are passed to an offspring from two parents.
Genes are made up of smaller molecules known as chromosomes.
The genes of a particular organism can never change throughout its lifetime.
In humans, genes are passed to an offspring from two parents.
Which of the following is a method of reproduction that generally occurs very rapidly?
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hybridizing
sexual
asexual
germination