Biology
Biology, 15.07.2019 10:30, zahinparvez69

In a testcross involving two heterozygous genes, equal numbers of recombinant and nonrecombinant progeny are produced. from this result, what can be concluded?

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Biology, 26.06.2019 16:40, gisellekarime
Let’s brush up on mapping. for questions 1-8, pure-breeding p0 animals were mated to generate f1 animals heterozygous at the b and w genes. the heterozygous f1 animals were test-crossed and yielded progeny with the phenotypes below. mutations in the b gene (b) cause a “no bristles” phenotype. mutations in the w gene (w) cause a “no wings” phenotype. both genes are haplosufficient. 45% normal bristles, normal wings 45% no bristles, no wings 5% no bristles, normal wings 5% normal bristles, no wings the numbers above suggest that the b and w genes are linked. what ratio of progeny would you have expected to see if b and w were on different chromosomes?
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Mathematics, 14.10.2019 21:00, christianhernan2
Asituation in which the coefficient of coincidence is greater than 1.0 would indicate that: a. the interference is high and one crossover suppresses the occurrence of a second one. b. no double crossovers were found in the progeny of a testcross, even though some were expected based on probability. c. the genes involved were actually assorting independently. d. there were more double crossovers in the progeny than would be expected based on probability. e. double crossovers were found in the progeny of a testcross, but there were fewer of them than would be expected based on probability
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Biology, 23.10.2019 02:50, tayymac1998
In cucumbers, heart-shaped leaves (h) are recessive to normal leaves (h) and having numerous fruit spines (n) is recessive to having few fruit spines (n). the genes for leaf shape and number of spines are located on the same chromosome; findings from mapping experiments indicate that they are 32.6 m.u. apart. a cucumber plant having heart-shaped leaves and numerous spines is crossed with a plant that is homozygous for normal leaves and few spines. the f1 progeny are then crossed with plants that have heart-shaped leaves and numerous spines (testcross). 5a. create a drawing to indicate the chromosomes, gene arrangements and phenotypes of the f1 parents and the nonrecombinant and recombinant progeny produced from the testcross. (8 points)
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Biology, 28.10.2019 21:31, andrewjewell2005
How would one explain a testcross involving f1 dihybrid flies in which more parental-type offspring than recombinant-type offspring are produced?
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