In a species of tree, seed color is determined by four independentlyassorting genes: A, B, C, and D. The recessive alleles of each of these genes (a, b,C, and d) produce abnormal enzymes that cannot catalyze a reaction in thebiosynthetic pathway for seed pigment.This pathway is diagrammed as follows:AWhite precursorYellow ----Orange----- Red---BlueWhen both red and blue pigments are present, the seeds are purple. Trees withthe genotypes Aa Bb Cc Dd and Aa Bb Cc dd were crossed.(a) What color are the seeds in these two parental genotypes?(b) What proportion of the offspring from the cross will have white seeds?(c) Determine the relative proportions of red, white, and blue offspring from thecross.

Name: In a species of tree, seed color is determined by four independentlya
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Description: In a species of tree, seed color is determined by four independentlyassorting genes: A, B, C, and D. The recessive alleles of each of these genes (a, b,C, and d) produce abnormal enzymes that cannot catalyze a reaction in thebiosynthetic pathway for

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Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

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In a species of tree, seed color is determined by four independently
assorting genes: A, B, C, and D. The recessive alleles of each of these genes (a, b,
C, and d) produce abnormal enzymes that cannot catalyze a reaction in the
biosynthetic pathway for seed pigment.
This pathway is diagrammed as follows:
A
White precursor
Yellow ----Orange----- Red
---
Blue
When both red and blue pigments are present, the seeds are purple. Trees with
the genotypes Aa Bb Cc Dd and Aa Bb Cc dd were crossed.
(a) What color are the seeds in these two parental genotypes?
(b) What proportion of the offspring from the cross will have white seeds?
(c) Determine the relative proportions of red, white, and blue offspring from the
cross.

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Genetics is a branch of the biology involved in the study of genes, genetic variation, and heredity in different organisms. Inheritance of traits in organisms occurs by passing discrete heritable units(genes) from parents to progeny.

The set of alleles for a given trait in an organism is called genotype, while the observable traits of the organism are called the phenotype. When organisms are heterozygous for a gene, one allele is called dominant that dominates over the phenotype of the organism, whereas the other allele is called recessive as it recedes and not observed.

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