BIOL 1510 Lecture Notes - Lecture 4: Zygosity, Sickle-Cell Disease, Pleiotropy

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yellowcattle191

19 May 2017

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Document Summary

Individuals that carry a recessive allele for an inherited disease. A structure, function, or attribute determined by a gene or group of genes. Cross-fertilization - preventing self fertilization and control other fertilization. Allele that produces its phenotype in heterozygous and homozygous form. Allele that produces its phenotype in only homozygous form. Maternal and paternal chromosomes paired together in a cell. Offspring form matings between true breeding parents that differ in one or more traits. Mating between parents that carry two different genetic determinants for the same trait. Linkage tendency of particular alleles of different genes to be inherited together. Locus location of a gene on a chromosome. Only between homozygous parents to produce homozygous offspring. Two members of each pair must segregate into different gamete cells during meiosis. Simultaneous expression of the phenotype associated with each allele in a heterozygote. Like blending, heterozygotes have phenotype between two different homozygous parents. Existence of more than two alleles of the same gene.

Related Questions

Hi I am studying for a biology exam and I have some questionsthat are on a review sheet that i am unsure about

1. In Tomatoes, the allele for red fruit is dominant over theallele for yellow fruit. If a plant that is homozygous for redfruit is crossed with a plant with yellow fruit â

a) what is/are the genotype(s) and the phenotype(s) of the fruitproduced in the F1 generation?

b) what is/are the genotype(s) and the phenotype(s) of the fruitproduced in the F2 generation?

c) what is the phenotypic ratio of the F2 fruit?

2. A plant with red flowers is crossed with a plant with whiteflowers. All the F1 plants produced red flowers. When the F1 plantsare allowed to self-pollinate, they produce 623 plants with redflowers and 198 plants with white flowers. What are the genotypesof the P and F1 generations?

3. In Tomatoes, the allele for red fruit isdominant over the allele for yellow fruit. Theallele for tall plants is dominant of the allele forshort plants. Find the genotypes and phenotypes ofthe F₁ and F₂ generations and the phenotypicratio of a cross between a homozygous dominant in both genes and ahomozygous recessive in both genes. The homozygous individuals arethe Parental generation.

4. In cocker spaniels, solid coat color is dominantover spotted coat. A veterinarian has a spaniel with a solidcoat. How can she unequivocally determine the genotype of thisanimal for coat color from a single breeding?

rubyserval737

In humans, sickle cell anemia is a disease caused by a mutation of a single locus gene which codes for an important blood protein. The allele for the normal protein (S) is dominant to that for the one causing sickle cell anemia. What gametes would be produced by individuals resulting from a SS x ss cross?

In turkeys, the normal bronze color is produced by a dominant gene âBâ. Its recessive allele âbâ produces red color. An independently assorting dominant gene, âNâ produces normal feathers. Its recessive allele ânâ produces hairy feathers.

Diagram a cross through the F2 generation between a homozygous bronze turkey with normal feathers (BBNN) and a red turkey with hairy feathers. (bbnn)

Diagram a cross through the F1 generation between a heterozygous bronze turkey with normal feathers and a red turkey with hairy feathers.