LAUNCHPAD F/WHAT IS LIFE
4th Edition
ISBN: 9781319231897
Author: PHELAN
Publisher: Macmillan Higher Education
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Chapter 8, Problem 8SA
Summary Introduction
To analyze:
Why crossing over is considered an important event in evolution.
Introduction:
Crossing over involves the swapping of fragments of chromosomes.
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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
- Why are the homologous regions of the X and Y chromosome important during meiosis?arrow_forwardHow is it possible for humans to differ genetically from each other if we all have the same genes arranged in the same order on our chromosomes?arrow_forwardHow 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_forward
- How does the diploid condition protect harmful recessive alleles from natural selection?arrow_forwardAmong different species, does extranuclear inheritance always follow a maternal inheritance pattern? Why or why not?arrow_forwardWhich of the following is least likely to produce genetic variation in the offspring of an individual? (a) a DNA replication error caused by DNA polymerase in a body cell of the individual (b) a cross over event during meiosis that creates a new combination of alleles in the gametes (c) independent assortment of chromosomes during meiosis that creates a new combination of alleles in the gametes (d) the random fertilization of an egg cell by a sperm cell during sexual reproductionarrow_forward
- The horse (Equus caballus) has 32 pairs of chromosomes, whereas the donkey (Equus asinus) has 31 pairs of chromosomes. How many total chromosomes would be expected in the somatic tissue of a mule, which is a hybrid of these two animals? Hint: a hybrid donkey is created by the union of a normal gamete from a horse and a normal gamete from a donkey. Group of answer choices 31.5 62 126 none of these is correct 63arrow_forwardIn mammals, more than one chiasma per chromosome arm is an indication that crossing-over has occurred. Scientists compared the average number of chiasma among the species shown in the table. Based on the data, which of the following questions could be asked to determine how the genetic diversity of these mammals would be affected in future generations? A - Are baboons or dogs more genetically diverse? B - Are horses more genetically diverse than other mammals? C - Are baboons less genetically diverse than other mammals? D - Do horses and cats express a comparable amount of genetic variation?arrow_forwardYou are an allele on a single uncondensed chromosome in a Yellowfever-carrying mosquito (Aedes aegypti) diploid cell (2n = 6). Demonstrate in as much detail as possible (1) how you will get to each genetically identical diploid cell of the multicellular offspring; (2) how you will get to the next generation of sexually reproduced progeny. Help, I no understand. Perhaps you will?arrow_forward
- One of the earliest postzygotic barriers to arise is hybrid sterility. Two plants can be crossed, but the resulting seeds grow into sterile plants that cannot reproduce. Is this as important in plants as it is in animals (Hint: How many types of hybrid flowers and fruits are there, compared to hybrid animals)?arrow_forwardLet’s suppose a genetic disease is caused by a mutantallele. If two affected parents produce an unaffected offspring, can themutant allele be recessive?arrow_forwardWhy are lethal dominant genes much more rare than lethal recessive genes?arrow_forward
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