Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 10.5, Problem 1CSR
Summary Introduction
To describe:
Whether the risk of skin cancer is selected against pale-skinned to balance selection in favor of pale skin for production of vitamin D.
Introduction:
Cancer can be defined as a group of diseases which are characterized by abnormal growth of cells. These cells have the ability to invade and spread to other tissues present in the body. Skin cancer is one of the most common types of cancer.
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So if skin color selection is not related to cancer, what accounts for the difference in skin color of different human populations? Meaning where is the selective pressure coming from to explain the differences in skin color?
Suppose that skin color in humans is controlled by 4 gene pairs, and that there are 2
alleles at cach gene pair (a "+" allele and a -"allele). Each "+ allele contributes a
unit of pigment above a baseline minimum skin tone, and each "-" allele contributes
no additional pigment. Which of the following genotypes would produce the same
phenotype as A A BB CC D'D? Assume that exposure to sunlight and/or
tanning beds are equal for all individuals.
OA'A*B* B* CC D'D
OA*A BBc c*D'D
Human hair color ranges from black to many shades of brown to blonde. What can you correctly conclude from this information?
A Human hair color is controlled by a single gene.
B Human hair color is controlled by environmental factors rather than genes.
C Human hair color is controlled by more than one gene.
D Black hair is dominant to blonde hair.
Answer is C? Can you help me to explain to me step by step?
Chapter 10 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 10.1 - The Rainbow Connection The genetic variability or...Ch. 10.1 - Prob. 1CYLCh. 10.1 - Prob. 2CYLCh. 10.1 - Prob. 3CYLCh. 10.2 - The Rainbow Connection As Tess and Chris Giddings...Ch. 10.2 - describe the steps and outcome of meiotic cell...Ch. 10.2 - Prob. 1HYEWCh. 10.2 - What would be the consequences for the resulting...Ch. 10.2 - Prob. 2CYLCh. 10.2 - What would be the genetic consequences for the...
Ch. 10.2 - Prob. 3TCCh. 10.3 - explain how meiosis and sexual reproduction...Ch. 10.4 - compare and contrast the three main types of...Ch. 10.5 - Prob. 1CSRCh. 10.5 - Prob. 1CTCh. 10.5 - Prob. 1CYLCh. 10.5 - describe some of the human genetic disorders that...Ch. 10 - Many plants car. reproduce sexually or asexually....Ch. 10 - Meiotic cell division produces ________ (how many)...Ch. 10 - Pairs of chromosomes with almost identical genetic...Ch. 10 - Prob. 1RQCh. 10 - Prob. 2FIBCh. 10 - Prob. 2MCCh. 10 - Prob. 2RQCh. 10 - Prob. 3FIBCh. 10 - Prob. 3MCCh. 10 - Prob. 3RQCh. 10 - Prob. 4FIBCh. 10 - Prob. 4MCCh. 10 - Diagram and describe the three main types of...Ch. 10 - Prob. 5FIBCh. 10 - Prob. 5MCCh. 10 - Describe how meiosis provides for genetic...Ch. 10 - Define nondisjunction, and describe common...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Most sheep have the ability to grow coats of wool that vary in their thickness depending on the ambient temperatures that they experience. This is an aspect of phenotypic plasticity, variability in the phenotype that can be triggered by the experiences of the organism. When referring to a sheep that has grown more wool in a cold climate than its parents living in a warm one, what term best describes this? (NOTE: look back at chapter 25, if you are having trouble remembering) O Adaptation Intersexual selection Intrasexual selection Acclimitization Gene Fixationarrow_forwardSelective breeding of a wild plant produced three different vegetable plants; broccoli, cabbage, and cauliflower plants. How do these three differ from each other genetically? They have different genes. They have the same alleles but express different proteins. They have the same genes but contain a different collection of alleles.arrow_forwardSeveral loci affect hair development in dogs. The allele for wire hair (W) is dominant to Its allele for straight hair (w). Allow H to represent hairlessness in the Mexican hairless dog and its recessive allele h to represent the gene for typical hair growth in other breeds. The Mexican hairless dog is homozygous for straight hair, but because of epistatic effects of H, alleles for hair formation cannot be expressed. Write genotypes of the following animals with respect to the two loci mentioned. a.) a Mexican hairless dog b.) a dog with straight hair c.) a dog from a strain that is pure breeding for wire hair.arrow_forward
- imagine that you finally solved the mystery of the color pattern of zebras. One gene defines the color of the fur, with two alleles for two colors: black (B) and white (b). Both alleles are co-dominant. Another gene regulates the expression of the color through epistasis. You name the two alleles for this regulator gene G and g. The dominant allele G is necessary for the fur color (white is considered a color) to be produced. The recessive g allele does not allow fur color expression. Zebra with no fur color expression appear green. You breed two double heterozygous zebras. A)What do these double heterozygotes look like?______________________ B) Fill the Punnett square and provide the predicted proportion of zebras of different colors from that cross.... The colors obtained are the following (include expected ratio or percentage): C)Naturally, there are no green zebras. Propose a genetic explanation for this lack of green zebras? Answer:arrow_forwardFigure illustrates albinism in two different species. Describetwo other genetic disorders found in both humans and animals.arrow_forwardExplain why skin color genetics is so much more complex than that of Mendelian traits.arrow_forward
- Albinism occupied a special place in the Hopi culture; individuals who possessed this trait were valued by members of the tribe. What are some examples of genetic traits that, in contrast, sometimes result in discrimination and prejudice?arrow_forwardChoose the correct option.arrow_forwardThe L gene in cats controls if they like to sit on your laptop (L) or on the book you are reading (I). L is dominant to I. The F gene controls how much fur cats shed. FF cats shed a lot, Ff cats some, and ff cats shed a little. The C gene controls how sharp their claws are: C is sharp, which is dominant to c. But it is a bit more complicated... Because the R gene controls how well they can retract their claws. rr cats cannot retract their claws, and thus, they are always touching the ground and are never sharp. Only RR or Rr cats have a possibility of sharp claws. The A gene is useful when cats are angry. AA cats growl. aa cats hiss. Aa cats growl and hiss. All of these genes are unlinked. These cats mate: Dad: LI Ff Cc Rr Aa Mom: II Ff Cc rr aa a) Which gene acts co-dominantly? b) Which gene acts partially/incompletely dominantly? c) How many types of gametes can each parent make? Show work. d) LIST all the gametes the mom cat can make. What fraction of the kittens (SHOW WORK for EACH…arrow_forward
- At least two pairs of genes control eye color. Both pairs influence the production of the pigment, melanin, but act independently. One pair of alleles is B (Brown color; dominant) and b (blue color); the other pair is A (pigment production; dominant) and a (no pigment production; albino). The gene pair aais epistatic to (masks) B and b and produces the nonpigmented eyes of the albino. What is the typeof gene interaction that exists between the two gene pairs? Give the genotypes and phenotypes of the possible offspring of the mating bbAa x Bbaa andi ndicate the parental phenotypes. (any method)arrow_forwardSkin colour in humans is determined by more than one gene pair, whereas Rh factor in blood is controlled by one gene pair. Which would show more variability in the human population? Why?arrow_forwardColorblindness is an X-linked recessive trait. You observe an isolated population and find that 20 females have the recessive colorblind phenotype, while the remaining 180 females do not. How many males would you expect to have this trait? show full work.arrow_forward
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