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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- a. State a hypothesis explaining the inheritance of flower color in painted tongues. b. Assign genotypes to the parents, F₁ progeny, and F2 progeny for all five crosses. c. In a cross between true-breeding yellow and true-breeding lavender plants, all of the F1 progeny are bronze. If you used F₁ plants to produce and F2 generation, what phenotypes in what ratios would you expect? Are there any genotypes that might produce a phenotype that you cannot predict from earlier experiments, and if so, how might this alter the phenotypic ratios among the F2 progeny?arrow_forwardA tall pea plant with terminal flowers (flowers on the ends of the stems) is crossed with a short plant thathas axial flowers. All 72 offspring are tall with axial flowers. This is a dihybrid cross with the height andflower position traits showing independent assortment. a. Name the dominant and recessive alleles. b. Give the genotypes of the parents and offspring in this cross. c. Predict the F2 offspring when the tall-axial F1's are allowed to self pollinate.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
- 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_forwardUsing the same information listed above for hair and eye color, (E = dominant brown eyes with e = recessive blue eyes; R = dominant brown hair and r = recessive blond hair), if the mom was heterozygous for both eye color and hair color what would her genotype be? a. EERR b. eerr c. EeRr What would be the 4 possible gametes the heterozygous mom could contribute? a. RE, Re, rE, re b. Rr, Ee, RE, re c. RR, rr, EE, eearrow_forward
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