Explain why a female can be heterozygous for an X-linked gene but a male cannot
What will be an ideal response?
Females have two X chromosomes and two alleles for all the genes on the X chromosome. A female could be, for example, Aa. A male has only one X chromosome and one allele for each gene on the X chromosome. He cannot be heterozygous.
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A steady state means that there is no variation in the functioning of a system
a. True, all systems must maintain homeostasis. b. False, there are a range of variables over which a system functions. c. True, there is a single optimal conditioning for body functions. d. False, most systems do not maintain homeostasis but rely on hormones.
An embryo having a blastodisc exhibits holoblastic cleavage
____________________ Indicate whether the statement is true or false.
Memory cells "remember" the antigen and make a faster and greater response the next time the antigen is encountered.
a. true b. false
In last week's lab we performed an experiment to see whether or not termites orient to the lines of black ink pens. In this experiment, _____ was the dependent variable and _____ was the independent variable.
A. Orientation of termites, presence of ink B. Time termites spend on side A, number of termites C. Presence of ink, orientation of termites D. Presence of ink, time termites spend on side A E. Time termites spent on side A, presence of ink