A mechanism for preventing sap loss entails closing sieve plate pores with callose, which is

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#Question id: 12500

#Unit 8. Inheritance Biology

In this pedigree II 1 is affected with an autosomal recessive disorder. The disease status for II 2, II 3 and II 4 is unknown. A and B represent alleles at a locus which is tightly linked to the disease locus with recombination fraction of 0. On the basis of the linked markers II 2 can be told that: 

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#Question id: 12501

#Unit 8. Inheritance Biology

In the pedigree shown, on the basis of the linked marker results II 3 can be told that:

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#Question id: 12502

#Unit 8. Inheritance Biology

In the pedigree shown, on the basis of the linked marker results II 4 can be told that:

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#Question id: 12503

#Unit 8. Inheritance Biology

In this pedigree II 1 is affected with an autosomal recessive disorder. The disease status for II 2 is unknown. A and B represent alleles at a locus which is tightly linked to the disease locus with recombination fraction of 0. Using the linked markers, II2 can be told that:

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#Question id: 12504

#Unit 8. Inheritance Biology

In this pedigree II 3 and III 1 are affected with an X-linked recessive disorder which is tightly linked to a marker locus with alleles A and B, with a recombination fraction of 0 between the disease and marker loci. Analysis of the linked marker results indicates that the disease must be segregating with:

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#Question id: 12505

#Unit 8. Inheritance Biology

The marker genotype for I 2 must have been: