In mice, the Y locus controls coat color, and the Y allele (yellow) is dominant to y (non-yellow). All yellow mice are believed to be heterozygous. A cross of two yellow mice results in a 2:1 ratio of yellow to non-yellow mice, indicating that some mice die early in development. Which of the following is an accurate description of the effect of the Y and y alleles on lethality? the Y allele is a dominant lethal allele the Y allele is a recessive lethal allele the y allele is a recessive lethal allele the y allele is a dominant lethal allele

In mice, the Y locus controls coat color, and the Y allele (yellow) is dominant to y (non-yellow). All yellow mice are believed to be heterozygous. A cross of two yellow mice results in a 2:1 ratio of yellow to non-yellow mice, indicating that some mice die early in development. Which of the following is an accurate description of the effect of the Y and y alleles on lethality? the Y allele is a dominant lethal allele the Y allele is a recessive lethal allele the y allele is a recessive lethal allele the y allele is a dominant lethal allele

Name: In mice, the Y locus controls coat color, and the Y allele (yellow) i
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Description: In mice, the Y locus controls coat color, and the Y allele (yellow) is dominant to y (non-yellow). Allyellow mice are believed to be heterozygous. A cross of two yellow mice results in a 2:1 ratio ofyellow to non-yellow mice, indicating that some mi

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 11RQ: The ABO blood groups in humans are expressed as the IA,IB and i alleles. The IAallele encodes the A...

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The ABO blood groups in humans are expressed as the IA, IB, and i alleles. The IA allele encodes the A blood group antigen, IB encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one quarter of their offspring will have AB blood type (IAIB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of: a. multiple alleles and incomplete dominance b. codominance and incomplete dominance c. incomplete dominance only d. multiple alleles and codominance
In guinea pigs, a black coat is dominant to an albino coat, and short hair is dominant to long hair. A BbHh ginea pig is crossed with a bbHH ginea pig. If 30 offspirng are produced, how many would be expeted to be a) black with short hair, b) albino with short hair, and c)albino with long hair?
What is a reciprocal cross? Suppose that a gene is found as a wildtype (functional) allele and a recessive mutant (nonfunctional)allele. What would be the expected outcomes of reciprocal crossesif a true-breeding normal individual was crossed to a true-breedingindividual carrying the mutant allele? What would be the results ifthe gene is maternally inherited?
The ABO blood groups in humans are expressed as the I A , I B , and i alleles. The I A allele encodes the A blood group antigen, I B encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (I A i) and a heterozygous blood type B parent (I B i) mate, one quarter of their offspring are expected to have the AB blood type (I A I B ) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of: a. multiple alleles and incomplete dominance b. codominance and incomplete dominance c. incomplete dominance only d. multiple alleles and codominance
Within a mouse population, the black fur allele (B) is dominant to the white fur allele (b) and the short whisker allele (S) is dominant to the long-whisker allele (s). A heterozygous black-furred short-whiskered mouse is crossed with a homozygous white-furred long-whiskered mouse. What percentage of the offspring will be black-furred with long whiskers?
n guinea pigs, an allele for rough fur (R) is dominant over an allele for smooth fur (r), and an allele for black coat (B) is dominant over an allele for white fur (b). What would be the genotype of a guinea pig with smooth black fur? *
In birds, wingspan is determined by two genes, one with complete dominance of one allele over the other, one with additive effects. Birds with genotype aabb has 16 cm long wingspan, whereas those with AABB has 20 cm long wingspan. A cross between AABB and aabb parents produced F1 with 19cm wingspan. Crossing the F1s produced F2 with the following phenotypes (in cm): 20.0 19.6 18.3 20.0 19.1 18.7 18.2 17.3 16.0 19.2 17.8 18.4 19.3 19.5 20.0 19.7 Determine the values of the following: NOTE: write the formula and the final answer Mean of the data Variance of the data Standard deviation According to these data, which wingspans are within one standard deviation of the mean?
In humans, Rh-positive individuals have the Rh antigen on their red blood cells, while Rh-negative individuals do not. If the Rh-positive phenotype is produced by a dominant gene (A), and the Rh-negative phenotype is due to its recessive allele (a), what is the frequency of the Rh-positive allele if 84% of a population is Rh-positive?
In mice, the presence of AA alleles give rise to the agouti fur color, AAY gives rise to a yellow fur color, and AYAY is lethal, causing mice to die before birth. The B allele results in pigment formation and is dominant over the b allele. The bb genotype results in no pigment formation and gives an albino fur color irrespectively of the presence of the AA or AAY alleles. In the following cross between a yellow and agouti mice, what would be the expected proportion of agouti fur mice among the live offspring? AAY Bb X AA Bb 1/2 1/4 3/8 1/3 3/4
While most commercial hens lay white eggs, certain Chinese and Chilean hens lay blue-green eggs. It is the result of an insertion mutation that causes blue eggshell pigment to be inherited as a dominant (B) allele (this was discovered by Punnett himself). In a flock of hens, there were 70 birds laying blue eggs and 30 laying white eggs.What is the Genotypic frequency for BB?
In rabbits, the color of body fat is controlled by a single genewith two alleles, designated Y and y. The outcome of this traitis affected by the diet of the rabbit. When raised on a standardvegetarian diet, the dominant Y allele confers white body fat,and the y allele confers yellow body fat. However, when raisedon a xanthophyll-free diet, a homozygote yy rabbit has whitebody fat. If a heterozygous rabbit is crossed to a rabbit withyellow body fat, what are the proportions of offspring withwhite and yellow body fat when raised on a standard vegetariandiet? How do the proportions change if the offspring are raisedon a xanthophyll-free diet?
In the Bombay phenotype, a homozygous recessive individual hh appears to have blood type O because she is unable to produce the H substance, which is required to make the A or B blood-type antigens. HH or Hh individuals normally produce H substance. What is the probability that a child will test as type AB blood from parents with the following genotypes? IAIO Hh X IBIO Hh 1/4 3/4 3/16 1/2 7/16