Problem 6 Short hair in rabbits is governed by a dominant gene (L) and long hair by its recessive allele (1). Black hair results from the action of the dominant genotype (B_) and brown hair from the recessive genotype (bb). a. Construct a Punnet square representing a cross between a dihybrid short, black, and homozygous short, brown rabbits. What genotypic and phenotypic ratios are expected among their progeny? b. Determine the expected genotypic and phenotypic ratios in progeny from the cross LLBB x Llbb. c. From crosses between LIBB and LIBb, c.1 What is the expected phenotypic ratio among the progenies? c.2 What progeny of the Fi genotypes breed true (i.e., what percentage is of homozygous genotypes)? c.3 What percentage of the F1 genotypes is heterozygous for only one pair of genes? c.4 What percentage of the F1 genotypes is heterozygous at both loci? c.5 What percentage of the Fi genotypes could be used for testeross purposes (i.e. homozygous double recessive)? c.6 What percentage of the Fi genotypes could be used for testeross purposes at the B locus (i.e., homozygous recessive bb)? c.7 What percentage of all short haired Fi individuals is expected to be brown?
Problem 6 Short hair in rabbits is governed by a dominant gene (L) and long hair by its recessive allele (1). Black hair results from the action of the dominant genotype (B_) and brown hair from the recessive genotype (bb). a. Construct a Punnet square representing a cross between a dihybrid short, black, and homozygous short, brown rabbits. What genotypic and phenotypic ratios are expected among their progeny? b. Determine the expected genotypic and phenotypic ratios in progeny from the cross LLBB x Llbb. c. From crosses between LIBB and LIBb, c.1 What is the expected phenotypic ratio among the progenies? c.2 What progeny of the Fi genotypes breed true (i.e., what percentage is of homozygous genotypes)? c.3 What percentage of the F1 genotypes is heterozygous for only one pair of genes? c.4 What percentage of the F1 genotypes is heterozygous at both loci? c.5 What percentage of the Fi genotypes could be used for testeross purposes (i.e. homozygous double recessive)? c.6 What percentage of the Fi genotypes could be used for testeross purposes at the B locus (i.e., homozygous recessive bb)? c.7 What percentage of all short haired Fi individuals is expected to be brown?
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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.
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Transcribed Image Text:Problem 6
Short hair in rabbits is governed by a dominant gene (L) and long hair by its recessive allele (1).
Black hair results from the action of the dominant genotype (B_) and brown hair from the recessive
genotype (bb).
a. Construct a Punnet square representing a cross between a dihybrid short, black, and homozygous
short, brown rabbits. What genotypic and phenotypic ratios are expected among their progeny?
b. Determine the expected genotypic and phenotypic ratios in progeny from the cross LLBB x
Llbb.
c. From crosses between LIBB and LIBB,
c.1 What is the expected phenotypic ratio among the progenies?
c.2 What progeny of the Fi genotypes breed true (i.e., what percentage is of homozygous
genotypes)?
c.3 What percentage of the Fi genotypes is heterozygous for only one pair of genes?
c.4 What percentage of the Fi genotypes is heterozygous at both loci?
c.5 What percentage of the F1 genotypes could be used for testcross purposes (i.e. homozygous
double recessive)?
c.6 What percentage of the F1 genotypes could be used for testeross purposes at the B locus (i.e.,
homozygous recessive bb)?
c.7 What percentage of all short haired Fi individuals is expected to be brown?
c.8 What percentage of all black F1 individuals will breed true for both black and short hair?
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