Three genes (A, B, and C) are found on three different chromosomes. For the following diploid genotypes, describe all of thepossible gamete combinations.A. Aa Bb Cc C. Aa BB CcB. AA Bb CC D. Aa bb cc
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Three genes (A, B, and C) are found on three different chromosomes. For the following diploid genotypes, describe all of the
possible gamete combinations.
A. Aa Bb Cc C. Aa BB Cc
B. AA Bb CC D. Aa bb cc
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- A diploid (2n) trihybrid individual with the genotype AaBbDd can make eight genetically different gametes. 2n = 4 n = 2 (1) A d. ID 1 1 2 2 Gt: AaBbDd Loci A/a and D/d are on chromosome 1 and locus B/b is on chromosome 2. Explain how a gamete containing the alleles A, D and b may be produced by meiosis. Refer specifically to meiotic events occurring during Prophase I, Metaphase I, Anaphase I and Anaphase II. (NB: remember to refer to the organism above). COHow many possible gametes will the following genotypes produce? List them. ddBB b. GgMM c. NnTtII.A. How many gamete classes would be formed from the following genotype: Tt Rr Ss Gg Yy? B. Deduce a simple formula for predicting the classes of gametes formed for heterozygous, diploid organisms, that can take into account number of genes being considered. Tt; TtRr; AaTtRr.
- A young couple is planning to have children. Knowing that there have been a substantial number of stillbirths, miscarriages, and fertility problems on the husband’s side of the family, they see a genetic counselor. A chromosome analysis reveals that, whereas the woman has a normal karyotype, the man possesses only 45 chromosomes and is a carrier of a Robertsonian translocation between chromosomes 22 and 13. a. List all the different types of gametes that might be produced by the man. b. What types of zygotes will develop when each of gametes produced by the man fuses with a normal gamete produced by the woman? c. If trisomies and monosomies entailing chromosomes 13 and 22 are lethal, approximately what proportion of the surviving offspring are expected to be carriers of the translocation?Chromosomal nondisjunction of the X chromosome in female gametes of humans means that live offspring can include Select one: O A. females with XX, and males with XY or XO O B. females with XX or XXX, and males with XY or XO O C. females with XX or XXX, and males with XY or XXY O D. females with XX, and males with XY E. females with XX or XO, and males with XY or OYAn organism has the following genotype AABbMmCC. What are the possible gametes that could be made from this organism?
- Assume that D, E, F, G, H, and I are autosomal genes on different chromosomes. From the mating (parent A) Dd ee Ff GG Hh li x (parent B) Dd EE FF Gg Hh ii. A. What is the probability that one of the offspring will have the genotype Dd Ee FF Gg hh li? B. What is the probability that one of the offspring will be heterozygous for each allele?During the process of Meiosis an individual's alleles for each trait are independently sorted to make unique gametes. A person is heterozygous for the Freckles phenotype (Ff) and also heterozygous for the PTC-tasting phenotype (Tt). This person's genotype for these two traits is represented as FfTt. A) How many unique gametes could be produced by this individual if you consider these two traits? B) List the different allele combinations that could result.The gene asSociated with the recessive disorder hemophilia is on the X chromosome, where h is the recessive copy and H is the dominant copy. The picture ("starting cell") shows a diploid cell from a male who has hemophilia, showing his X and Y chromosomes. Starting cell Xh Y Which of these pictures A-E will NOT occur at any time in meiosis of this starting cell? Select ALL that apply. D Xh Xh C YIY В X YI YY E Xh Y A X Xh ¡YY
- What types of gametes are formed by the following genotypes? All gene pairs are segregating independently. а. ААВЬСС b. AABBCCDDHuman females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With respect to X chromosome alleles, how many different types of gametes can a male produce? b. If a female is homozygous for an allele on an X chromosome, how many types of gametes can she produce with respect to that allele? c. If a female is heterozygous for an X chromosome allele, how many types of gametes can she produce with respect to that allele?An individual is heterozygous for a reciprocal translocation, with the following chromosomes: A • B C D E F A • B C V W X R S T • U D E F R S T • U V W X a. Draw a picture of these chromosomes pairing in prophase I of meiosis. b. Draw the products of alternate, adjacent-1, and adjacent-2 segregations. c. Explain why the fertility of this individual is likely to be less than the fertility of an individual without a translocation.