Type II survivorship curves
a. are characteristic of humans and elephants.
b. indicate a fairly constant rate of death at all
ages.
c. indicate a high mortality rate in the very
young.
d. are characteristic of species in which most
individuals live a relatively long life and
die of old age.
e. are typical of species with high biotic
potentials.
B
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How do you explain this result?
You are trying to improve growth in an economically important fish species. These fish have a gene for large size with two alleles (L,l). You cross a large female (LL) with a small male (ll) and get all large fish! The genotypes of the F1 are 100% Ll, so you assume that large size is dominant to small. You then cross a small female with a large male and get all small fish! The genotypes of this F1 are normal. A. The gene for large size is a maternal effect gene. B. L is not dominant to l. C. The gene for large size is a sex-linked gene. D. L is dominant to l. E. The gene for large size is a maternal effect gene and L is dominant to l.
Exchange of genetic material among different species is called
A. homolgous gene exchange. B. horizontal gene transfer. C. exon shuffling. D. genetic recombination. E. exon shuffling and or genetic recombination.
Sex-linked genes are ____
a. found on autosomes b. only found on the Y chromosome c. only inherited from the mother d. involved in sex determination and can be found on any chromosome e. found on the X and Y chromosomes
The movement of alleles among populations is
called
a. a bottle neck. b. mutation. c. a founder effect. d. gene flow. e. genetic drift