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18 Jan 2018

In a certain plant, branch length is under the control of three genes. Branches can be absent or 1-6 cm long. Which of the following crosses can produce a plant having branches of 6 cm? [PLEASE EXPLAIN ANSWER, DO NOT ANSWER THIS QUESTION WITHOUT AN EXPLANATION]

AaBBcc x AAbbcc

AABBcc x AaBbCC

AaBbCC x AAbbCC

AaBbCC x AaBBCc

none of the above

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. In rye grass, seed color is a polygenic trait (additivemodel). If true-breeding red and white varieties are crossed, theF1 are intermediate in color. If the F1 are self-fertilized, about1 in 64 have white seeds. If the F1 are testcrossed, how manydifferent genotypic categories will be produced?

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B. 4/64

C. 6/64

D. 15/64

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8. A tall parent and a short parent produce intermediate F1offspring that, when self-fertilized, produce a range of offspringheights, some taller than the tall P1 and some shorter than theshort P1. Which set of parental genotypes could account for thesedata?

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greenworm666

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Received two different answers how to do this

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One said to use sex genes of birds ZW

Z^lr W x Z^Lr Z^LR

Second one said to use LLRr x llrr

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Dd Pp	122	2
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dd Pp	4	82
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!!!Please help. I do not know how to tell if this is coupling or repulsion to help me start the problem. please be detailed in your explanation. Thanks in advance.

Explain why different proportions of progeny are produced when plant A and plant B are crossed with the same dwarf pubescent plant.

A. The differences are due to sampling error and are statistically insignificant.

B. Plant A has the two loci in coupling configuration; Plant B has the two loci in repulsion.

C. Plant A has the two loci in repulsion; Plant B has the two loci in coupling configuration.

D. The two plants have different linkage maps for the two genes. E. The two loci are located on a region of the chromosome that has undergone a deletion in plant B compared to plant A.