In guinea pigs coat color is determined by a single gene with two alleles. A guinea pig from a true-breeding black strain is mated with a guinea pig from a true-breeding white strain. The F1 progeny are all black. Two of the F1 progeny are mated with each other. What proportion of the F2 progeny is expected to be white?
a. 1/2
b. 1/3
c. 1/4
d. 3/4
Answer: c. 1/4
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In a genetic cross, there are n classes of data. What would the degrees of freedom be for a chi-square test on this data?
A. n B. n + 1 C. n - 1 D. 2n + 1 E. x(n) where x equals the number of individuals in the cross
In what way or ways does or do seedless
vascular plants differ from seed plants?
a. seedless vascular plants do not have a sporophyte stage; seed plants do b. the sporophyte of the seed plants gives rise to gametes; the sporophyte of seedless vascular plants gives rise to spores c. the gametophyte of the seedless vascular plants is free-living; the gametophyte of seed plants is not d. the sporophyte of seedless vascular plants is haploid; the sporophyte of the seed plants is diploid e. the gametophyte of the seed plants form spores; the gametophyte of the seedless vascular plants form gametes
What structures are used for direct cell to cell signaling?
Desmosomes Tight junctions Exocytosis vesicles Gap junctions
A single breeding male red-winged blackbird (Agelaius phoeniceus) may mate with several females, but each female usually mates with only one male. This type of mating system is known as:
a. polygynandry. b. polyandry. c. monogamy. d. polygyny. e. serial monogamy.