23. A dirid cross like the examples studied in lab with the corm plants (TGg X g

Question

23. A dirid cross like the examples studied in lab with the corm plants (TGg X g) should result in a: a. A 1:1 ratio of tall greens : dwarf albinos b. A 2:1 ratio of dwarf greens: tall albinos c. A 1:1:1:1 tall greens : dwarf greens : tall albinos: dwarf albinos d. A9:3:3:1 tall greens : dwarf greens: tall albinos: dwarf albinos 24.You do a dual trait cross in fruit flies (you are watching two different traits), 50% of the offspring are new combinations not visible in the parents (are recombinants). The genes for these two traits: a. b. c. d. Are close together 5 map units apart Are on different chromosomes Either B or C could be true 25.A loci is the proper position of a gene on a chromosome a. True b. False 26. A researcher was doing her crosses in fruit flies and found that the hairy leg and dwarf antennac traits are almost always inherited together. These traits could be said to be a. Homologous b. X-linked c. Y-linked d. Linked e. Recessive 27.One of the first ways genes were located on chromosomes is by constructing linkage maps. These maps are made by: a. Studying the recombination frequencies between two traits at once b. Staining a chromosome with fluorescent stains c. Studying a single trait through multiple crosses

Explanation / Answer

23. Option D is correct.

Mendel dihybrid phenotypic ratio = 9:3:3:1

24. Option D is correct.

Recombinants can be seen only when the genes are far apart or on different chromosomes.

25. True.

A Locus refers to the exact physical position of a gene in the genome.

26. Option D is correct.

When two traits are inherited always together, they are said to be linked.

27. Option A is correct.

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