Describe the interactions between genes and the environment in the sex determination of some reptiles; explain their
relevance to human sex determination What will be an ideal response?
ANSWER: Maleness and femaleness are determined by complex interactions between genes and the
environment. Sex determination in some reptiles illustrates the role of environmental factors
in determining sex. The internal temperature of the nest in which the eggs develop
determines the sex of the offspring. In some species, higher temperatures produce females
and lower temperatures produce males. In other species, the opposite is true. From the study
of humans, it is clear that someone having an XX or XY chromosome set does not always
mean someone develops as a female or male. The outcome depends on the distribution and
expression of genes on the X and Y chromosomes and interactions between genes on these
chromosomes with many different environmental factor
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Why is it so important that all of the chromosomes align on the metaphase plate during metaphase?
A. This is the only place in the cell where the cyclins and Cdks are located. B. If they cannot, it suggests that they aren't properly attached to the spindle microtubules, and thus won't separate properly during anaphase. C. This is the location where the chromosomes can become attached to the spindle microtubules. D. This allows asters to form. E. This allows sister chromatids to form.
The fastest land animal is the cheetah, which can run about 70mph. The fact that its main prey species, the Thomson's gazelles can run about 50 mph, which is also very fast, is likely the result of ____
a. character displacement b. disruptive selection c. interference competition d. predator-prey coevolution e. mimicry
What is the primary source for new, unique genes in a population?
A) mutation B) natural selection C) artificial selection D) crossing over
The term "metabotropic" refers to:
A) slow synapses B) oxygen use C) direct ion channels D) a tropical disease