BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 13, Problem 4GP
Summary Introduction
To determine:
The probability of a heterozygous surviving kitten.
Introduction:
Individuals in the population carry a specific set of alleles, known as genotype. The examples of genotype are homozygous and heterozygous. The
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Heterozygous individuals perpetuate some alleles that have lethal effects in homozygous individuals. A mutated allele (ML) associated with taillessness in Manx cats (left) is an example. Cats homozygous for this allele (MLML) typically die before birth due to severe spinal cord defects. In a case of incomplete dominance, cats heterozygous for the ML allele and the normal, unmutated allele (M) have a short, stumpy tail or none at all. Two MLM cats mate. What is the probability that any one of their surviving kittens will be heterozygous?
In humans, the genetic disease cystic fibrosis is caused by a recessive allele (a). The normal (healthy) allele is dominant (A).
What is the genotype of someone who has cystic fibrosis?
What are the two different genotypes that a healthy person could have?
If two people were both heterozygous for the cystic fibrosis gene, what fraction of their children would be likely to have this disease? Hint: Draw a Punnett square to figure it out.
In alley cats, the coat color is determined by a gene carried on the X-chromosome. At the same time, the alleles are expressed as intermediate (incomplete-dominance) inheritance. Genotypes and color are as follows:
Females:
X ^ b * X ^ b =yellow
X^ B X ^ b = calico
X ^ B * X ^ B =black
Males:
X ^ y * Y =yellow
X ^ B * Y=bhck
(a) A black cat has a litter of seven kittens: three black males, one black female and three calico females. Comment on the probable paternity of this litter and explain.
Chapter 13 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 13 - A heterozygous individual has _______ for a trait...Ch. 13 - An organisms observable traits constitute its...Ch. 13 - In genetics, F stands for filial, which means...Ch. 13 - The offspring of the cross AAaa are ________. a....Ch. 13 - The second-generation offspring of a cross between...Ch. 13 - Refer to question 4. Assuming complete dominance,...Ch. 13 - Independent assortment means _______. a. alleles...Ch. 13 - A testcross is a way to determine _________. a....Ch. 13 - Assuming complete dominance, crosses between two...Ch. 13 - The probability of a crossover occurring between...
Ch. 13 - True or false? All traits are inherited in a...Ch. 13 - One gene that affects three traits is an example...Ch. 13 - ________ in a trait is indicated by a bell curve.Ch. 13 - The phenotype of individuals heterozygous for...Ch. 13 - Match the terms with the best description. ___...Ch. 13 - Mendel crossed a true-breeding pea plant with...Ch. 13 - Assuming that independent assortment occurs during...Ch. 13 - Determine the predicted genotype frequencies among...Ch. 13 - Prob. 4GPCh. 13 - A single allele gives rise to the HbS form of...Ch. 13 - In sweet pea plant, an allele for purple flowers...
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- In cows, there is a "splotchy" phenotype that is splotches of brown and white. A true-breeding white cow (homozygous recessive) is bred to a true-breeding brown cow (homozygous dominant). In the resulting offspring, 75% have spots of brown and white and 25% are brown. The phenotype described displays what kind of relationship(s) between alleles? Incomplete penetrance Incomplete penetrance Variable expressivity Variable expressivity Incomplete dominance Incomplete dominance Codominancearrow_forwardIn cats, the locus for orange coat color is sex linked. Male cats that are black have the o+ allele, whereas those that are orange have the o allele. Females can be homozygous for the orange allele or homozygous for the black allele and will express each color, respectively. Heterozygous females are tortoise-shelled or calico, having orange and black patches. A calico cat, in addition to being heterozygous at the orange locus, also is either heterozygous or homozygous for the incompletely dominant, autosomal spotting allele (SS = large spots, Ss = small spots, ss = no spots). Manx tails are caused by a dominant trait that is lethal when homozygous. Long tails are the result of a homozygous recessive genotype. An orange male with small white spots and a manx tail is crossed to a calico female with small white spots and a manx tail. What is the probability of observing a solid black female with no spots and long tail? (Hint: All calico cats are female!)arrow_forwardIf an individual has the dominant phenotype for an x-linked trait, what is/are the possible genotype(s)? if an individual has the recessive phenotype for an x-linked trait, what what is/are the possible genotype(s)? Practice a Punnet square for each of the following autosomal combinations. Assume complete dominance. Determine the genotype and phenotype ratios of the offspring. Genotype ratio = _____GG : _____ Gg: ______gg. Phenotype ratio = _________dominant trait : __________recessive trait. parents with genotypes GG and Gg parents with genotypes Gg and Gg parents with genotypes GG and gg parents with genotypes Gg and gg Practice a Punnet square for each of the following x-linked combinations. Determine the genotype and phenotype ratios of the offspring. Genotype ratio = _____XGXG: _____ XGXg: ______XgXg:_______XGY: _____XgY. Phenotype ratio = _________dominant trait : __________recessive trait. parents with genotypes XGXG and XgY parents with genotypes XGXg and XgY parents with…arrow_forward
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