In a monohybrid cross AA xaa, what proportion of heterozygous is expected among the F2 offspring? A. 1/4 B. 1/2 C. 3/4 D. All are heterozygous. E. None are heterozygous.
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- For each of the terms in the left column, choose thebest matching phrase in the right column.a. phenotype 1. having two identical alleles of a given geneb. alleles 2. the allele expressed in the phenotype ofthe heterozygotec. independent 3. alternate forms of a gene assortmentd. gametes 4. observable characteristice. gene 5. a cross between individuals bothheterozygous for two genesf. segregation 6. alleles of one gene separate into gametesrandomly with respect to alleles of othergenesg. heterozygote 7. reproductive cells containing only onecopy of each geneh. dominant 8. the allele that does not contribute to thephenotype of the heterozygotei. F1 9. the cross of an individual of ambiguousgenotype with a homozygous recessiveindividualj. testcross 10. an individual with two different allelesof a genek. genotype 11. the heritable entity that determines acharacteristicl. recessive 12. the alleles an individual hasm. dihybrid cross 13. the separation of the two alleles of agene into…Albino rabbits (lacking pigment) are homozygous forthe recessive c allele (C allows pigment formation).Rabbits homozygous for the recessive b allele makebrown pigment, while those with at least one copy ofB make black pigment. True-breeding brown rabbitswere crossed to albinos, which were also BB. F1 rabbits, which were all black, were crossed to the doublerecessive (bb cc). The progeny obtained were 34black, 66 brown, and 100 albino.a. What phenotypic proportions would have beenexpected if the b and c loci were unlinked?b. How far apart are the two loci?Three genes in fruit flies affect a particular trait, andone dominant allele of each gene is necessary to get awild-type phenotype.a. What phenotypic ratios would you predict amongthe progeny if you crossed triply heterozygous flies?b. You cross a particular wild-type male in successionwith three tester strains. In the cross with one testerstrain (AA bb cc), only 1/4 of the progeny are wildtype. In the crosses involving the other two testerstrains (aa BB cc and aa bb CC), half of the progeny are wild type. What is the genotype of thewild-type male?
- But for part A if you cross dd ll x DD LL, won't all the offspring be DdLl (dark colored and long legged), so wouldn't NONE of the offpspring have short legs and light body coloration? Isn't the 9:3:3:1 ratio only for two heterozygous dihybrid crosses? Where is the 25/4 coming from? Could you draw a punnett square to demonstrate.The genotypic ratio is 1 FF: 2 Ff: 1 ff, or simply 1:2:1, butthe phenotypic ratio is 3:1. Why?Which among the following statements is INCORRECT? O A. The arrangement of chromosomes in metaphase I and metaphase Il in Meiosis is not random, therefore, the inheritance of a trait will not affect the inheritance of the other trait O B. All statements are correct OCif a cross produces 100% heterozygous genotype, then all of the offspring will exhibit the dominant allele D.Only one of the two gene copies present in an organism is distributed to each gamete (egg cell / sperm cell) because of the separation of homologous chromosomes and sister chromatids during meiosis.
- In peas, yellow seed (Y) is dominant over green seed (y). Inthe F2 generation of a monohybrid cross that begins when adominant homozygote is crossed with a recessive homozygote,you would expecta. three plants with yellow seeds to every plant with greenseeds.b. plants with one yellow seed for every green seed.c. only plants with the genotype Yy.d. only plants that produce yellow seeds.e. Both c and d are correct.Rabbits may be classified as agouti, chinchilla, Himalayan, or albino according to coat color. A cross between CC h x C ch c produced 5 agouti, 3 chinchilla and 2 Himalayans. d. If the two F1 agouti genotypes will be crossed, what percentage of theiroffspring will have the same phenotype? e. What will be the genotypes of the rabbits in (d)?A dihybrid cross between a homozygous dominant for two traits (YYGG) is crossed with a homozygous recessive for two traits (yygg). A. What percentage of the offspring would be YyGg in the F1 generation? B. What is the expected phenotypic ratio of the F2 generation?
- In this case a family history revealed a genetic basis for the disorder. The pedigree is shown in Fig. 1 Below. Key Ø Female: affected Female: unaffected I || IV V TOLO 5 DO 머 9 10 a. Any of these options is possible b. III.5 but not V.3 would display the disease O c. V.3 but not III.5 would display the disease O d. Neither III.5 nor V.3 would display the disease Oe. Both III.3 and V.3 would display the disease 10 ન Male: affected Male: unaffected Deceased Disease status not given Dizygotic twins Monozygotic twins Fig. 1 Disease pedigree. Five generations I, II, III, IV, V are shown. Females are represented by circles, males by squares, dizygotic (non-identical) twins by diagonal lines originating from the same point, Monozygotic (identical) twins by diagonal lines originating from the same point and joined symbols and deceased by a diagonal line through the symbol. Filled symbols indicate that the individual displays the disease phenotype. Unfilled symbols indicate that the individual…We have crossed true-breeding flies today. Wild type to mutant. Their phenotypes were wt and vg se. (Let’s not worry about males and females for now, just assume both genes are autosomal, which is normal in a Mendelian experiment). The results of a cross are phenotypes. I will be asking you for numbers or a ratio of phenotype numbers you expect to see in the offspring from this cross. To answer this, you’ll need to start with the genotypes of parents, then write their gametes, then write the offspring genotypes, then get the phenotypes based on them. Predict the results of this cross: In case both mutations are recessive; In case both mutations are dominant; In case vestigial wings are recessive and the sepia eyes are dominant.In the edible pea, tall (T) is dominant to short (t), and greenpods (G) are dominant to yellow pods (g). List the typesof gametes and offspring that would be produced in thefollowing crosses:a. TtGg * TtGgb. TtGg * TTGGc. TtGg * Ttgg