When observing the events in a single meiocyte with a single crossover, what proportion of gamete’s have the parental combination of alleles and what proportion have a recombinant genotype?
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- there are 120 pink flowers and 112 white collected as a result of the second filial generation. What are the parental genotypes of the parents?In tomatoes, red fruit is dominant to yellow fruit, and purple stems are dominant to green stems. Thegenes encoding these traits are on different homologous chromosomes. The progeny from a matingconsisted of 305 red fruit, purple stem plants; 328 red fruit, green stem plants; 110 yellow fruit,purple stem plants; and 97 yellow fruit, green stem plants. What would be the genotypic and phenotypic outcome if each parent was self-fertilized?A man is homozygous dominant for ten different genes that assort independently. How many genotypically different types of sperm could he produce? A woman is homozygous recessive for eight of these genes and is heterozygous for the other two. How many genotypically different types of eggs could she produce? What can you conclude about the relationship between the number of different gametes possible and the number of heterozygous and homozygous gene pairs that are present?
- Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With respect to X-linked alleles, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele? c. If a female is heterozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele?If two loci are 10 cM apart, what proportion of the cells in prophase of the first meiotic division will contain a single crossover in the region between them?A female of genotype a b c + + + produces 100 meiotic tetrads. Of these, 68 show no crossover events. Of the remaining 32, 20 show a crossover between a and b, 10 show a crossover between b and c, and 2 show a double crossover between a and b and between b and c. Of the 400 gametes produced, how many of each of the 8 different genotypes will be produced? Assuming the order a–b–c and the allele arrangement previously shown, what is the map distance between these loci?
- The probability that both alleles in the offspring are type A is the product of the probability that the allele from the pollen is A and the probability that the allele from the ovule is A (we will derive this in Section 6.5). What is the probability that the offspring of a homozygous parent is homozygous? What is the probability that the offspring of a homozygous parent is heterozygous?Consider an individual with the AB/ab genotype, and assume that alleles of the A and B genes areunable to recombine during meiosis. If this individual is crossed with an individual who is homozygousrecessive at both genes (ab/ab), what is the expected phenotype ratio in the offspring?Most of the individuals of a certain wildflower population have white flowers, although a few are purple-flowered. Crosses have demonstrated that the allele for white color flower (W) is dominant over the allele for purple (w). Give the genotype of a purple-flowered plant, and show the gametes that it would produce as a result of meiosis. If two heterozygous white-flowered plants are crossed. What fraction of the offspring do you expect to be purple? If two purple-flowered plants are crossed, what fraction of their offspring do you expect to be white?
- Most of the individuals of a certain wildflower population have white flowers, although a few are purple-flowered. Crosses have demonstrated that allele for white color flower (W) is dominant over the allele for purple (w). Give the genotype of a purple-flowered plant, and show the gametes that it would produce as a result of meiosis. If two heterozygous whoite-flowered plants are crossed. What fraction of the offspring do you expect to be purple? If two purple-flowered plants are crossed, what fraction of their offspring do you expect to be white?Diagram the types of gametes you would expect from a ++/yw female, given no crossovers, one crossover, two crossovers, three crossovers, and fours crossovers between bonsister chromatids of homologous chromosomes?In the following cross, imagine that you have a female fly that has two Xs and one Y due to a nondisjunction event in her mother's germ cells. Draw out what the possible gametes are for both the female and the male and also a Punnett square showing the genotypes, phenotypes, and sex of the possible flies as a result of this cross. You do not need to provide the probabilities of each of these. Red-eyed wi C Ở Red-eyed wt XX Y X Y Meiosis
