Human Anatomy & Physiology (2nd Edition)
2nd Edition
ISBN: 9780134553511
Author: Erin C. Amerman
Publisher: PEARSON
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Chapter 27.7, Problem 2QC
Summary Introduction
To review:
The differences between homozygous and heterozygous alleles.
Introduction:
Genes are segments of DNA (deoxyribonucleic acid) that can code for a specific protein. They act as the blueprint for all organs and tissues. The different variant forms of genes are called alleles, and they always exist in a pair in an individual. Alleles allow a variety of combinations, such as a homozygous allele and a heterozygous allele.
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A woman with fair skin, blond hair, and blue eyes gives birth to fraternal twins; the father has dark brown skin, dark hair, and brown eyes. One twin has blond hair, brown eyes, and light skin, and the other has dark hair, brown eyes, and dark skin. What Mendelian law does this real-life case illustrate and explain what this means in terms of the inherited alleles for these genes?
Chapter 27 Solutions
Human Anatomy & Physiology (2nd Edition)
Ch. 27.1 - What are the three major periods of prenatal...Ch. 27.1 - 2. When does the postnatal period of life begin?
Ch. 27.2 - Prob. 1QCCh. 27.2 - What are the steps of fertilization?Ch. 27.2 - 3. What is the function of cleavage of the...Ch. 27.2 - How does a morula differ from a blastocyst?Ch. 27.2 - 5. What is the ultimate fate of the inner cell...Ch. 27.2 - 6. Which cell type secretes hCG?
Ch. 27.2 - 7. What are the functions of amniotic fluid?
Ch. 27.2 - 8. What are the main functions of each of the...
Ch. 27.3 - Prob. 1QCCh. 27.3 - 2. Which cells form the three germ layers?
Ch. 27.3 - 3. What are the two types of embryonic folding?...Ch. 27.3 - What is the first major event that occurs during...Ch. 27.3 - Prob. 5QCCh. 27.4 - Prob. 1QCCh. 27.4 - Prob. 2QCCh. 27.4 - What specific changes occur in each month of fetal...Ch. 27.4 - Prob. 4QCCh. 27.5 - Prob. 1QCCh. 27.5 - Prob. 2QCCh. 27.5 - Which hormone stimulates the beginning of...Ch. 27.5 - Prob. 4QCCh. 27.6 - What are the criteria used to determine a newborns...Ch. 27.6 - Prob. 2QCCh. 27.6 - 3. Explain what happens to each structure in the...Ch. 27.6 - Prob. 4QCCh. 27.6 - What role do hormones play in the let-down reflex...Ch. 27.7 - What is the genome? How many chromosomes are in...Ch. 27.7 - Prob. 2QCCh. 27.7 - 3. How does a genotype differ from a phenotype?
Ch. 27.7 - Prob. 4QCCh. 27.7 - Prob. 5QCCh. 27.7 - 6. What is an X-linked disorder? How can a female...Ch. 27 - Match the correct time period of gestation with...Ch. 27 - Prob. 2CYRCh. 27 - Mark the following statements about fertilization...Ch. 27 - Prob. 4CYRCh. 27 - Number the sequence of events in fertilization....Ch. 27 - Prob. 6CYRCh. 27 - Match the extraembryonic membrane with the correct...Ch. 27 - Prob. 8CYRCh. 27 - Match the structures of the embryo with the...Ch. 27 - What are the two types of embryonic folding?Ch. 27 - Prob. 11CYRCh. 27 - Prob. 12CYRCh. 27 - Prob. 13CYRCh. 27 - Prob. 14CYRCh. 27 - Prob. 15CYRCh. 27 - Prob. 16CYRCh. 27 - 17. Fill in the blanks: The first ____________...Ch. 27 - Prob. 18CYRCh. 27 - Prob. 19CYRCh. 27 - Which pattern of inheritance includes examples of...Ch. 27 - Prob. 1CYUCh. 27 - Why is the single-celled zygote approximately the...Ch. 27 - Prob. 3CYUCh. 27 - Prob. 4CYUCh. 27 - Prob. 1AYKACh. 27 - Prob. 2AYKACh. 27 - Prob. 3AYKACh. 27 - Prob. 4AYKACh. 27 - Prob. 5AYKB
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- For a recessive condition, two normal heterozygous individuals have children. What is the likelihood of their children being affected by this condition? What is the likelihood of their children being carriers without the condition? What is the likelihood of their asymptomatic children being carriers? Suppose that an individual with the condition has children with a heterozygous individual, what is the likelihood of their children being carriers?arrow_forwardWhich statement is false when considering alleles and genes? a) A given gene can have many different possible alleles. b) Alleles are alternative forms or variants of genes. c) Individuals can be homozygous or heterozygous, and this refers to which alleles they have for a particular gene. d) An allele is the same thing as a gene.arrow_forwardThe allele for hitchhiker’s thumb (h) is recessive to straight thumb (H). If a man and his wife are both homozygous recessive, will any of their offspring potentially have hitchhikers thumb? What is the man’s genotype and the woman’s genotype? What is the man’s phenotype and the woman’s phenotype? What genotype(s) must the offspring have in order to have the phenotypic trait of hitchhiker’s thumb? Do a cross to determine all potential hitchhiker’s thumb genotypes and phenotypes for the offspring of this man and woman. Is it possible for any offspring of the F1 generation to have hitchhiker’s thumb?arrow_forward
- What are three similarities and three differences between Mendelian and Polygenic traits?arrow_forwardAlbinism is an autosomal (not sex-linked) recessive trait. A man and woman are both of normal pigmentation and have one child out of three who is albino (without melanin pigmentation). What are the genotypes of the albino's parents? Both parents must be homozygous dominant. Both parents must be heterozygous. One parent must be homozygous dominant; the other parent must be heterozygous. One parent must be heterozygous; the other parent can be homozygous dominant, homozygous recessive, or heterozygous. One parent must be homozygous for the recessive allele; the other parent can be homozygous dominant, homozygous recessive, or heterozygous. O O O O Oarrow_forwardIf there are five alleles at a locus, how many genotypes can there be at this locus? How many different kinds of homozygotes can there be? How many genotypes and homozygotes can there be with eight alleles at a locus?arrow_forward
- Since the white‑eye trait is X‑linked recessive, what result would you expect when crossing a heterozygous red‑eyed female with a white‑eyed male? all red‑eyed progeny In each sex, half of the offspring will have red and half of the offspring will have white eyes. all red‑eyed females with half of the males having white and half of the males having red eyes all red‑eyed females and all white‑eyed males all red‑eyed males with half of the females having white and half of the females having red eyesarrow_forwardThe allele A is brown fur and the allele a is white fur. In a mating between a heterozygous male and a heterozygous female, what is probability that they will have an offspring with brown fur and what is the probability they will have an offspring with white fur?arrow_forwardUsing the concepts of non-mendelian genetics, what is the phenotypic ratio of the offspring if two heterozygous pea plants with purple flowers are crossed together? O 3 pea plants with light purple flowers: 1 pea plant with a single mixed color for white and purple color. O 3 pea plants with purple flowers: 1 pea plant with light violet flowers. O 1 pea plant with purple flowers: 2 pea plants with white flowers: 1 pea plant with mixed color for white and purple color. O 1 pea plant with purple flowers: 2 pea plants with light purple flowers: 1: pea plant with white flowers.arrow_forward
- In pedigrees, individuals are usually specified by using a Roman numeral for their generation in the chart and an Arabic number for their position (reading left to right) within that generation. If we use the letter c for the allele that causes cystic fibrosis, what are the genotypes of individuals III-3 and III-4 (the third and fourth individuals shown in generation III) in the pedigree that shows this disease?arrow_forwardFor any gene with a dominant allele A and recessive allele a, what proportions of the offspring from an AA × Aa cross are expected to be homozygous dominant, homozygous recessive, and heterozygous?arrow_forward. In Figure 2-17, how does the 3:1 ratio in the bottom-lefthand grid differ from the 3:1 ratios obtained by Mendel?arrow_forward
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