The human X and Y chromosomes _____
A) are both present in every somatic cell of males and females
B) are the same size and have the same number of genes
C) include genes that determine an individual's sex
D) are called autosomes
C
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How would you design an sRNA to bind to a sequence?
A) select six continuous nucleotides from the sequence B) take the complementary sequence of six continuous nucleotides C) select 200 continuous nucleotides from the sequence D) take the complementary sequence of 200 continuous nucleotides
If a geneticist describes a trait as being 70% penetrant, what would they mean?
A. Individuals with the trait show variation in expression B. It is lethal in 30% of the individuals who have the trait C. Only 70% of the individuals who carry the allele(s) for a trait express the trait D. The trait is present in 70% of the population
Speciation often occurs when a habitat becomes more heterogeneous. In Lake Victoria different species of cichlids are found in different areas of the lake. The best explanation for this speciation is that
A) natural selection favored different heritable variations in different parts of the lake. B) male cichlids that lived in deep water needed to be seen by females, so they became colorful. C) food was scarce in the lake, so some fish had to learn how to scrape algae, some had to learn to eat insects, and some had to learn to bite leaves. D) humans selected for many different traits in cichlids in order to market them to the aquarium trade.
Of the two lungs, the one on the left is usually smaller than the one on the right. This provides space for the ________
Fill in the blank(s) with correct word