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Chapter 9 Hybrid Biology

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A trait that is most common in nature
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Terms in this set (25)
A trait that is most common in nature
Which of the following is the best definition of a "wild-type" trait?
Gametes that are different from the parental gametes
Crossing over of genes on homologous chromosomes during meiosis leads to which of the following?
Set up each monohybrid cross, calculate the probabilities for each allele pair in that cross, then multiply the probabilities together. Your denominator will be 256.
A tetrahybrid cross is one involving four characters that assort independently. You want to estimate the outcomes of such a cross in your pet fruit-flies. How will you estimate the frequencies of genotypes in the offspring?
Tests of fetal cells or DNA in mother's blood
Which of the following prenatal diagnostic tests involves the least risk to the mother or fetus AND is most informative regarding genetic disorders?
Unaffected woman; affected man
In a family pedigree to trace a trait of interest, an empty circle represents a/an _________________. A blackened square represents a/an ______________. ("Affected" means "has trait of interest" "unaffected" means "Does not have trait of interest.")
1/16
Filomena is a carrier for albinism, a recessive genetic disorder. Javier is also a carrier for this trait. They fall in love and marry. What is the probability that two of their children will have albinism?
Females are XX; Males are XO and half of their sperm lack a sex chromosome
Some insects, such as grasshoppers and roaches, have a sex determination system called "X-O." What are the characteristics of males and females in this system?
None of them, because people with Type O blood make antibodies against all other blood types
Maria, Susan, Josh, and LaShonda are exploring in a cave. Suddenly, Susan is injured by a rockslide and requires an immediate blood transfusion. Fortunately, all four are experienced medics and have all the equipment they need to perform a transfusion. Everyone knows his or her blood type. Who should volunteer to provide blood for Susan, and why?
Frogs with a wide range of leg sizes
You love to eat frogs' legs and want to start raising frogs. Your friend tells you that the size of frogs' legs is inherited with incomplete dominance, with the L allele for great big legs dominant and ll frogs have tiny legs. You believe, however, that frog leg size is a polygenic trait. When you visit a neighboring frog farm to start you new career, what observation would you prove that you are correct?
Alleles separate from each other (segregate) during gamete formation
Which of the choices most accurately summarizes Mendel's law of segregation as expressed using modern genetic termiology?
Excess mucous production that affects the lungs, liver, and other organs.
What are the main signs or symptoms of the most common lethal genetic disorder in the United States?
Different alleles of the gene are present at the same locus on homologous chromosomes
An individual is heterozygous for a particular gene. Which of the following is true of this individual?
3:1
In pea plants, the yellow seed allele (Y) is dominant over the green seed allele (y). What is the phenotype ratio of yellow seeds to green seeds in the F2 generation resulting from a cross between two true- breeding parents, one with YY and one with yy?
Character; trait; alleles of a gene
Fur color in dogs is a/an _________. Black fur on a Labrador retriever is a/an _____________. The black fur is the result of the interaction between two ___________.
1 red; 2 pink; 1 white
A red snapdragon (RR) is crossed with a white snapdragon (rr). R is known to be incompletely dominant to r. Members of the F1 generation are then crossed. What is the ratio of flower colors in the F2 generation?