A gene on the X chromosome in chickens controls the rate of feather production. The allele for slow feather production, B, is dominant to the allele for rapid feather production, b. Crosses carried out by a farmer are shown in Figure 1 below. Figure 1 Key Male chickens are XX Female chickens are XY Male - rapid feather production Male - slow feather production Female - rapid feather production Female - slow feather 1 2 production 7 10 11 12 13 From the figure above provide one piece of evidence that shows that a recessive allele is responsible for rapid feather production. a) b) Provide all the likely genotypes of chicken 5 and chicken 7 in Figure 1 above. A cross between two chickens produced four offspring. This resulted in two of these being males with rapid feather production and two being females with slow feather production. Provide the possible genotypes of the parents. c)

A gene on the X chromosome in chickens controls the rate of feather production. The allele for slow feather production, B, is dominant to the allele for rapid feather production, b. Crosses carried out by a farmer are shown in Figure 1 below. Figure 1 Key Male chickens are XX Female chickens are XY Male - rapid feather production Male - slow feather production Female - rapid feather production Female - slow feather 1 2 production 7 10 11 12 13 From the figure above provide one piece of evidence that shows that a recessive allele is responsible for rapid feather production. a) b) Provide all the likely genotypes of chicken 5 and chicken 7 in Figure 1 above. A cross between two chickens produced four offspring. This resulted in two of these being males with rapid feather production and two being females with slow feather production. Provide the possible genotypes of the parents. c)

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 1ACQ: Figure 8.9 In pea plants, round peas (R) are dominant to wrinkled peas (r). You do a test cross...

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Environmental health and hazards

An organism's environment is the environment in which it lives and has an impact on its well-being. The World Health Organization (WHO) defines environmental health as "those aspects of public health, such as quality of life, that are influenced by physical, chemical, biological, social, and psychosocial components in the environment." Environmental health is concerned with both natural and man-made settings in order to enhance public health. Environmental science, occupational medicine, toxicology, and epidemiology are the key subdisciplines of environmental health.

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A gene on the X chromosome in chickens controls the rate of feather production.
The allele for slow feather production, B, is dominant to the allele for rapid
feather production, b. Crosses carried out by a farmer are shown in Figure 1
below.
Figure 1
Key
Male chickens are XX
Female chickens are XY
Male - rapid feather
production
Male - slow feather
production
Female - rapid feather
production
Female - slow feather
1
2
production
7
10
11
12
13
From the figure above provide one piece of evidence that shows that a
recessive allele is responsible for rapid feather production.
a)
b)
Provide all the likely genotypes of chicken 5 and chicken 7 in Figure 1
above.
A cross between two chickens produced four offspring. This resulted in two
of these being males with rapid feather production and two being females
with slow feather production. Provide the possible genotypes of the
parents.
c)

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Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?
In sweet pea plant, an allele for purple flowers (P) is dominant when paired with a recessive allele for red flowers (p). An allele for long pollen grains (L) is dominant when paired with a recessive allele for round pollen grain (l). Bateson and Punnett crossed a plant having purple flowers/long pollen grains with one having white/flowers/round pollen grains. All F1 offspring had purple flowers and long pollen grains. Among the F2 generation, the researchers observed the following phenotypes: 296 purple flowers/long pollen grains 19 purple flowers/round pollen grains 27 red flowers/long pollen grains 85 red flowers/round pollen grains What is the best explanation for these results?
A walnut comb rooster is mated to three hens. Hen A, which has a walnut comb, has offspring in the ratio of 3 walnut to 1 rose. Hen B, which has a pea comb, has offspring in the ratio of 3 walnut to 3 pea to 1 rose to 1 single. Hen C, which has a walnut comb, has only walnut comb offspring. What are the genotypes of the rooster and the three hens?
Figure 12.5 In pea plants, round peas (R) are dominant to wrinkled peas (r). You do a test cross between a pea plant with wrinkled peas (genotype rr) and a plant of unknown genotype that has round peas. You end up with three plants, all which have round peas. From this data, can you tell if the round pea parent plant is homozygous dominant or heterozygous? If the round pea parent plant is heterozygous, what is the probability that a random sample of 3 progeny peas will all be round?
A proband female with an unidentified disease seeks the advice of a genetic counselor before starting a family. Based on the following data, the counselor constructs a pedigree encompassing three generations: (1) The maternal grandfather of the proband has the disease. (2) The mother of the proband is unaffected and is the youngest of five children, the three oldest being male. (3) The proband has an affected older sister, but the youngest siblings are unaffected twins (boy and girl). (4) All the individuals who have the disease have been revealed. Duplicate the counselors feat
The young woman shown at right has albinismvery pale skin, white hair, and pale blue eyes. This phenotype is due to the absence of melanin, which imparts color to the skin, hair, and eyes. It typically is caused by a recessive allele. In the following situations, what are the probable genotypes of the father, the mother, and their children? a. Both parents have normal phenotypes; some of their children are albino and others are not. b. Both parents and all their children are albino. c. The mother is not albino, the father is albino, and one of their four children is albino.
The F1 flies described in question 1 were mated with brown-eyed flies from a true-breeding line. What phenotypes would you expect the offspring to have? (a) all with red eyes (b) all with brown eyes (c) half with red eyes and half with brown eyes (d) red-eyed females and brown-eyed males (e) brown-eyed females and red-eyed males
Figure 18.14 Which is most likely to survive, offspring with 2n+l chromosomes or offspring with 2n-l chromosomes?
The genotype XXY corresponds to: a. Klinefelter syndrome b. Turner syndrome c. Tripto-X d. Jacob syndrome
Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F2 progeny? a. 8lOroundseeds b. 8lOwrinkledseeds c. 405:395 round seeds:wrinkled seeds d. 610:190 round seeds:wrinkled seeds
Given the karyotype shown at right, is this a male or a female? Normal or abnormal? What would the phenotype of this individual be?
Figure 13.4 Which of the following statements is true? Recombination of the body color and red/ cinnabar eye alleles will occur more frequently than recombination of the alleles for wing length and aristae length. Recombination of the body color and aristae length alleles will occur more frequently than recombination of red/brown eye alleles and the aristae length alleles. Recombination of the gray/black body color and long/short aristae alleles will not occur. Recombination of the red/brown eye and long/short aristae alleles will occur more frequently than recombination of the alleles for wing length and body color.