A woman is colorblind. What do you know about her parents?
a. Her mother must be colorblind.
b. Her father must be colorblind.
c. Only one of her parents is a carrier of the colorblind trait.
d. Both her parents must be colorblind
B
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A mutation in the lacI gene prevents the gene product from binding allolactose. What will the expression level of the operon be in the absence of lactose?
A. no transcription B. postive regulation C. constitutively active D. low level of expression
Suppose that in plants, smooth seeds (S) is dominant to wrinkled seeds (s), and tall plants (T) is dominant to short plants (t). An F1 plant from a mating between homozygous plants that were tall/smooth and short/wrinkled was crossed to the short/wrinkled parent. What proportion of the progeny is homozygous for short and wrinkled alleles?
A) 1/2 B) 1/4 C) 1/8 D) 1/16 E) 0
Studies have shown that in the flowering plant Arabidopsis the development of parts of a flower is
governed by
a. differential uptake of hormone signals from the leaves. b. the oxygen gradient from outside to inside of the closed flower. c. differentiation of cell types as they are formed from the apical meristem. d. the timing of cell division. e. the expression patterns of several floral organ homeotic genes.
________ are heritable changes in a gene or chromosome
Fill in the blank(s) with correct word