All mammals have three middle-ear bones which evolved from
A. wing bones of birds.
B. bones in the reptile jaw.
C. cartilage of shark skeletons.
D. jaws of fishes.
Answer: B
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Knockout experiments involving __________ genes
in fruit flies (Drosophila melanogaster) revealed local controls over gene expression. Fill in the blank(s) with the appropriate word(s).
If a small region of a chromosome containing a non-essential gene is completely deleted, and an organism has two identical chromosomes with this deletion, then the organism
A) has no alleles of that gene. B) is dead. C) has more heterochromatin. D) has recessive alleles of those genes. E) will exhibit pseudodominance.
The ciliary muscle changes the shape of the lens
____________________ Indicate whether the statement is true or false.
The gene pool for a particular population is made up of
A) all the genes that occur in the population. B) all the alleles for a certain trait in a given individual. C) all the genes for a certain trait that occur in the population. D) the sum of all the homozygous individuals in the population. E) the sum of all the heterozygous individuals in the population.