Concept explainers
A.
To determine: Why calico cats are almost female.
Concept introduction: Some of the cats are white with patches of two colors (usually black and orange). Such cats are called as calico cats. The coat colors in them are determined and are associated with the X chromosomes. Most of the calico cats are females. One of their color coats is determined by the maternal X chromosome and the other with the paternal X chromosome. Males are rare as they have only one sex chromosome and mostly the males are often sterile.
B.
To determine: Why the calico cats are rare and sterile.
Concept introduction: Some of the cats are white with patches of two colors (usually black and orange). Such cats are called as calico cats. The coat colors in them are determined and are associated with the X chromosomes. Most of the calico cats are females. One of their color coats is determined by the maternal X chromosome and the other with the paternal X chromosome. Males are rare as they have only one sex chromosome and mostly the males are often sterile.
C.
To propose: A mechanism that would give rise to the white fur.
Concept introduction: Some of the cats are white with patches of two colors (usually black and orange). Such cats are called as calico cats. The coat colors in them are determined and are associated with the X chromosomes. Most of the calico cats are females. One of their color coats is determined by the maternal X chromosome and the other with the paternal X chromosome. Males are rare as they have only one sex chromosome and mostly the males are often sterile.
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Chapter 10 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
- Two black mice were mated and produced 12 black and 4 white offspring. Explain these results, giving the genotypes of parents and progeny.arrow_forwardA fruit fly with a gray body and red eyes (genotype BbPp) is mated with a fly having a black and purple eye (genotype bbpp).1.Show diagrammatically a genetic cross between the two flies and the possible genotypes and phenotypes of F1. What ratio of offspring would you expect if the body-color and eye-color genes are on different chromosomes (unlinked)? 2. When mating is actually carried out, most of the offspring look like the parents, but 3% have a gray body and purple eyes, and 3% have a black body and red eyes. Compare and discuss the observation with your answer in part (a)arrow_forwardFruit flies are very useful model organisms that have been used to study genetics. One mutant recessive trait in fruit flies is called "eyeless" because it causes flies to have no eyes. Cross an eyeless fly with a homozygous normal fly. a. Draw the Punnett square. b. What is the genotyoe ratio of the offspring? c. What is the phenotype ratio of the offspring? d. What genetic problem is this? (monohybrid, dihybrid or multiple allele)arrow_forward
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- In German cockroaches, bulging eyes, bu, are recessive to normal eyes, bu, and curved wings, cv, are recessive to straight + + + wings, cv Both traits are encoded by autosomal genes that are linked. A cockroach has genotype bu bu cv cv, and the genes are in repulsion. . Which set of genes will be found in the most common gametes produced by this cockroach? + CV CV O bu cv + о bu bu + + Obu cv O bu cv +arrow_forwardQuestions a to e are answerable by yes or no. Indicate the possible parental genotypes if your answer is yes.a. Can a man with hairy ears have a hairy-eared daughter?b. Can two normal parents produce a colorblind son?c. Can two normal parents produce a colorblind daughter?d. Can a colorblind woman have a normal son?e. Can a bald man have a nonbald daughter?arrow_forwardWhat is the correct table in these two given? 1. Take two coins and assume that heads represent the dominantallele (A) and tails represents the recessive allele (a). The genotype for each coin isheterozygous (Aa).2. Assume that each coin represents one parent. When a single coin is flipped, one gameteis formed (through the process of meiosis). If the flipped coin is on heads, then thegamete has the dominant allele (A). When both coins are flipped simultaneously, therewill be two possible gametes that can combine through fertilization to form a zygote. Eachtime you flip both coins, you will record the “genotype” of the offspring.3. Flip the coins 100 times and record your results in the chart belowarrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning