BIOSC-116 Lecture Notes - Lecture 10: Punnett Square, Degenerative Disease, Genetic Disorder

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coppermule660

16 Jun 2020

School

Diablo Valley College

Department

Biological Science

Course

BIOSC-116

Professor

Khan

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Document Summary

Recessive genetic disorders homozygous recessive. the f1 generation which were all purple: for every 3 purple plants there was 1 white, makes required protein incorrectly or not at all. Wanted to create a variety of plants that would make the same phenotype. True breeding of white and purple flowers. Once he was satisfied with true breeding, he cross pollinated them and then made. Crossed that generation amongst themselves and some white came back. When 2 individuals that are heterozygous for a trait are crossed. Determines the probability of an offspring having a particular genotype. The punnett square is a simple grid device that shows the expected frequencies of. To have a recessive disease (express it in their phenotype) an individual must be. The recessive allele for the gene is faulty in some way: If an individual is heterozygous for the disease they are referred to as carriers, Have to be homozygous recessive parents both have to be heterozygous.

Related Questions

1) The seed color in a species of flowering plant can be either green or white, with the trait determined by two independently assorting loci. At one locus, the G allele produces green color and is dominant to the recessive g allele for white. At the other locus the dominant, C, allele code for color production and its recessive counterpart, c, codes for colorless or white seeds. A pure-breeding green seeded plant is crossed with a white-seeded plant homozygous for both loci.

a) Identify all possible genotype(s) for the white-seeded parent and the F1 genotype(s) that each would produce when crossed with the true-breeding green seeded plant.

b) Assume that the genotype of the original white-seeded parent is gg, cc, F1 plants from the cross described in a. are crossed to produce the F2. Identify the F2 phenotypes and their expected ratio.

c) What would be the probability of producing a white-seeded plant in a cross between two F2 plants of the genotypes Ggcc and ggCc.

2) A snapdragon plant that bred true for white petals was crossed to a plant that bred true for purple petals with no spots, and all the F1 had white petals. The F1 was selfed and among the F2 three phenotypes were obtained in the following numbers: white 240 purple no spots 61 purple with white spots 19 total 320

a) Propose and justify an explanation for these results, showing genotypes for all generations. Make up your own symbols

b) Calculate the chi square value for the data and decide on your hypothesis. Use the chi-square table provided in probability module

For each problem I need to know the following plus whateverspecifics the problem requests:

Key: (Which symbol stands for which allele) â Use the sameletter for a gene using a capital to designate dominant and lowercase to show recessive.

Parental genotypes

Possible gametes for each parent

The Punnett Square

1. In guinea pigs black coat color is dominant to brown coatcolor. A black guinea pig (from a long line of black guinea pigs)is bred to a brown guinea. If one of these offspring is then bredto a different brown guinea pig, what are the expected genotypesand phenotypes of their offspring?

2. In pea plants tall stems are dominant to short stems andpurple flowers are dominant to white flowers. A true breeding plantwith tall stems and white flowers is crossed with a true breedingplant having short stems and purple flowers. The offspring fromthis cross are grown up and allowed to interbreed. What are theexpected genotypes and phenotypes of their offspring?

3. In dogs, black is dominant to golden. You have a blackLabrador retriever you would like to stand at stud, but first youwant to know if it is homozygous black or heterozygous. You make atestcross to determine this. What are the expected genotypes andphenotypes if your dog is heterozygous? If it is homozygous?

4. Color-blindness is X-linked in humans. A color-blind manmarries a woman whose father was color-blind. What are the expectedgenotypes and phenotypes of their children?

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BIOSC-116 Lecture Notes - Lecture 10: Punnett Square, Degenerative Disease, Genetic Disorder

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