Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Textbook Question
Chapter 8, Problem 9RQ
What is the reason for doing a test cross?
a. to identify heterozygous individuals with the dominant
b. to determine which allele is dominant and which is recessive
c. to identify homozygous recessive individuals in the
d. to determine if two genes assort independently
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What is the reason for doing a test cross?a. to identify heterozygous individuals with the dominant phenotypeb. to determine which allele is dominant and which is recessivec. to identify homozygous recessive individuals in the F2d. to determine if two genes assort independently
What does a Punnett square tell you?
a.The inheritance pattern for a pair of alleles
b.The phenotype probabilities of offspring for a given cross
c.The number of offspring who will have a particular genotype for a given cross
d.The genotype probabilities of offspring for a given cross
2.What would be the most likely karyotype for somebody described as “hemizygous positive for a Y-linked trait”?
a.Y+ Y+
b.X Y+
c.X+ Y+
d.X+ Y-
3.X-linked ichthyosis is an X-linked recessive trait that manifests in part as dry, scaly skin (“ichthy-” = fish or fish like). Suppose a couple are considering having a child together. Parent A is heterozygous for the ichthyosis allele while Parent B is hemizygous negative for the ichthyosis allele. What is the probability their child would be unafflicted with ichthyosis but be a carrier of the ichthyosis-causing allele?
a.0%
b.25%
c.50%
d.75%
e.100%
4.If somebody has the phenotype of…
What can you assert regarding cytoplasmic inherited traits?
A.
extensive phenotypic variation exhibited, even within a single family
B.
reciprocal crosses that give different results
C.
All of the answers are correct.
D.
usually inherited from one parent, typically the maternal parent
E.
present in both males and females
Chapter 8 Solutions
Concepts of Biology
Ch. 8 - Figure 8.9 In pea plants, round peas (R) are...Ch. 8 - Figure 8.10 In pea plants, purple flowers (P) are...Ch. 8 - Figure 8.16 What ratio of offspring would result...Ch. 8 - Imagine that you are performing a cross involving...Ch. 8 - Imagine that you are performing a cross involving...Ch. 8 - The observable traits expressed by an organism are...Ch. 8 - A recessive trait will be observed in individuals...Ch. 8 - What are the types of gametes that can be produced...Ch. 8 - What is the reason for doing a test cross? a. to...Ch. 8 - If black and white true-breeding mice are mated...
Ch. 8 - The ABO blood groups in humans are expressed as...Ch. 8 - In a cross between a homozygous red-eyed female...Ch. 8 - When a population has a gene with four alleles...Ch. 8 - Describe one of the reasons that made the garden...Ch. 8 - Use a Punnett square to predict the offspring in a...Ch. 8 - Use a Punnett square to predict the offspring in a...Ch. 8 - Can a male be a carrier of red-green color...Ch. 8 - Could an individual with blood type O (genotype...
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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
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- A test cross is used to determinea. the genotype of an organism with a phenotypically dominant trait.b. the genotype of an organism with a phenotypically recessive trait. c. the genotype of an organism showing pleiotropic effects of a gene.d. if a trait is inherited polygenically.arrow_forwardHow can a polygenic trait be easily identified? a. There ae only two possible phenotypes for the trait. b. The graphing of the possible phenotypes results in a bell curve. c. The presence of the polygenic trait masks the other possible alleles involved. d. The environment has a greater influence on the trait.arrow_forwardIn a test cross, peas of an unknown genotype are crossed with peas of a known genotype. In this example, smooth peas are the unknown and wrinkled peas are the known (rr). If half of the offspring from that cross are smooth and half are wrinkled, what is the genotype of the unknown plant? O a. Homozygous dominant: RR O b. Homozygous recessive: rr Oc. Incomplete dominance d. Heterozygous dominant: Rr CLEAR MY CHOICEarrow_forward
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