Biology: Science for Life with Physiology (5th Edition)
5th Edition
ISBN: 9780321922212
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 7LTB
What is the physical basis for the independent assortment of alleles into offspring?
- There are chromosome divisions during gamete production;
- Homologous chromosome pairs are separated during gamete production;
- Sperm and eggs are produced by different sexes;
- Each gene codes for more than one protein;
- The instruction manual for producing a human is incomplete.
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Chapter 7 Solutions
Biology: Science for Life with Physiology (5th Edition)
Ch. 7 - What is the relationship between genotype and...Ch. 7 - Prob. 2LTBCh. 7 - Prob. 3LTBCh. 7 - Prob. 4LTBCh. 7 - Prob. 5LTBCh. 7 - Scientists have recently developed a process by...Ch. 7 - What is the physical basis for the independent...Ch. 7 - Prob. 8LTBCh. 7 - Prob. 9LTBCh. 7 - Prob. 10LTB
Ch. 7 - Prob. 1GPCh. 7 - Prob. 2GPCh. 7 - Prob. 3GPCh. 7 - Prob. 4GPCh. 7 - Pfeiffer syndrome is a dominant genetic disease...Ch. 7 - Prob. 6GPCh. 7 - A cross between a pea plant that produces round...Ch. 7 - Prob. 8GPCh. 7 - The allele BRCA2 was identified in families with...Ch. 7 - Two parents both have brown eyes, but they have...Ch. 7 - Prob. 2AAATBCh. 7 - Prob. 3AAATBCh. 7 - Prob. 1CTSCh. 7 - Prob. 2CTSCh. 7 - Prob. 3CTS
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- How is it that some chromosomal abnormalities are incompatible with life as early as immediately after fertilization, others may lead to spontaneous abortion within the gestation period, while others may lead to babies born but eventually expire?arrow_forwardIn birds, females are heterogametic (ZW) while males are homogametic (ZZ). Rarely, a hen’s ovarymay lose its function and a testis develops instead. The chromosomal make-up does not change.What sex ratio would you expect among the living progeny of a sex-reversed hen and a normal hen?(Note: WW dies)arrow_forwardIn the X-Y and Z-W systems of sex determination, which sex is theheterogametic sex, the male or female?arrow_forward
- A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism? HhTt T HT Hharrow_forwardTrue or False: When an individual generates gametes via meiosis the gametes either receive all of their maternal alleles or all of their paternal alleles? b) Explain your answer.arrow_forwardStephanie conducts an experiment to study sex reversal in a specific grographic location. She collects cells from newborn babies and examines them under a microscope over seven years. Among 6,100 newborn males, three have one Barr body, and all other babies have no Barr body. Among 6,300 newborn females, four have two Barr bodies and the rest have one. What of the following statements is not true? 1. About 0.5 % of boys have an additional X chromosome, so they have forty-seven chromosomes. 2. Barr body is a small and dense structure of inactivated X chromosome. 3. Nondisjunction could produce an altered number of sex chromosomes. 4. Having an unusual number of Barr bodies indicates that the organism has more than two X chromosomes.arrow_forward
- Earlobes can be attached to the face or non-attached. An attached earlobe is a recessive trait. A female with attached earlobes (Il) has a child with a man with non-attached earlobes. He is heterozygous for this trait. Questions: a. What are the possible genotypes of the egg the woman can produce? b. What are the possible genotypes of the sperm the man can produce? c. What is the genotype ratio for the offspring? d. What is the phenotype ratio for the offspring? e. What is the couple's chance of having a child with attached earlobes?arrow_forwardDuring oogenesis, meiosis results in:A) four equally sized cells that stop dividing in meiosis 1B) 2 equally sized cells, but only one that is typically fertilizedC) 2 equally sized cells that are both typically fertilizedD) 2 or 3 small cells and one large cell that develops further if fertilizedarrow_forwardWhat are the non-random events that occur during sexual reproduction (post-meiosis) in humans? Please be specific on naming the events.arrow_forward
- Using Figure 17-37, calculate what percentage of conceptions are triploid. The same figure shows XO in the spontaneous-abortion category; however, we know that manyXO individuals are viable. In which of the viable categories would XO be grouped?arrow_forwardHuman sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele? c. If a female is heterozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele?arrow_forwardA man is homozygous dominant for ten different genes that assort independently. How many genotypically different types of sperm could he produce? A woman is homozygous recessive for eight of these genes and is heterozygous for the other two. How many genotypically different types of eggs could she produce? What can you conclude about the relationship between the number of different gametes possible and the number of heterozygous and homozygous gene pairs that are present?arrow_forward
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