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Mendelian Genetics

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Mendelian Genetics

Postby Masher123 » Sun Sep 09, 2012 3:40 am

Hey guys I was wondering if you could give me some help in answering a couple questions. I honestly have no idea where to start and how to do it. much appreciated :D

Pea pod shape is controlled by a one gene - two allele genetic system. Full pod shape is completely dominant to constricted pea pod shape. Pea plant size is also controlled by a one gene – two allele system with tall size being completely dominant to dwarf size. Given a plant was heterozygous for pod shape and homozygous recessive for plant size

a. What is the phenotype of this plant?

b. If this plant was crossed to a dihybrid (heterozygote), what would be the phenotypic ratio of pod shape among the progeny?

c. What would be the phenotypic ratio of plant size?

d. What would be the phenotypic ratio of pod shape and plant size together?


Q2: A pure breeding, tall pea plant white flowers is crossed with a pure-breeding short plant with red flowers. The F1 plants are tall with red flowers. When allowed to self-fertilise themselves, these F1 plants produce the following F2: 326 tall, red; 104 tall, white; 117 short red and 29 short white. Explain these data; indicating genotypes of the parents and the different F2 phenotypes. What is the expected numbers in the various F2 classes? Test the goodness of fit between the data and your hypothesis using χ2.
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Postby JackBean » Sun Sep 09, 2012 9:23 am

So? Where's your attempt to solve it?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Re: Mendelian Genetics

Postby Cat » Sun Sep 09, 2012 4:26 pm

Masher123 wrote:Hey guys I was wondering if you could give me some help in answering a couple questions. I honestly have no idea where to start and how to do it. much appreciated :D



You can start by answering question 1A. If you are unable to tell phenotype of that, I think no one will be able to help you. I don't mind helping, but you need to show that you know at least something...
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