Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Textbook Question
Chapter 8, 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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An individual with XY chromosomes produces gametes where 50% have an extra sex chromosome and 50% have no sex chromosomes. Given this information, what is the probability a fertilized egg will have the genotype XO? Assume that the egg has the expected 23 chromosomes prior to fertilization.
1/3
1/2
1/8
1/4
It is not 1/3 or 1/4
In a germline cell of genotype Ff Qq where genes F and Q are on different chromosomes, capital and
lowercase letters represent alternate alleles (versions or variants) of each gene. If this cell undergoes
normal meiosis to produce sperm, what are the possible sperm genotypes?
FQ, fq, Fq, fQ
Ff, Qq, FQ, fq, Fq, fQ
O Ff, Ff, Qq, Qq
O F, f, Q, q
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?
Chapter 8 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
Ch. 8 - What is the relationship between genotype and...Ch. 8 - Add labels to the figure that follows, which...Ch. 8 - Prob. 3LTBCh. 8 - Prob. 4LTBCh. 8 - Prob. 5LTBCh. 8 - Scientists have recently developed a process by...Ch. 8 - What is the physical basis for the independent...Ch. 8 - Prob. 8LTBCh. 8 - Prob. 9LTBCh. 8 - Prob. 10LTB
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- Stephanie 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_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_forwardA 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_forward
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