ooo T-Mobile LTE10:15 PM Back 2 Messages Hi 4 19. When a from a plant 20. Colorb
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ooo T-Mobile LTE10:15 PM Back 2 Messages Hi 4 19. When a from a plant 20. Colorblindness is an X-linked recessive trait A woman whe does not carry the color-blindness allele has children with a man who is colorblind What proportion of their children will be 21 What is the term for an observable trait of an organism a pheneeype h hybrid d alele 22. Mendel postulated that individuals have genetic elements that exist in pairs, which determine a single phenotype. What de we now know these pairs of elements to be? b two alleles of a gene on homologous chromosomes c pairs of sister chromatids d a sperm and an eg 23 A and a are dominant and recessive alleles, respectively, of the same ge. Which genotypels) would result in an individual with the dominant phenotype? h only AA c. AA and Aa d only Aa 24. Cystic fibrosis (CF) is caused by a recessive allele. A child has CF, even though neither of his parents has CF. Which of the following describes the genotypes of the parents? a. One is homozygous recessive for the CF geme, and the other is heterozyous b. They are both homozygous recessive for the CF gene c They are both homozygous dominant for the CF d. They are both heteroaygous for the CF gene gene.Explanation / Answer
19. C. Asexual reproduction. Asexual reproduction is the right answer because it involve generation of offspring from a single parent inheriting the genes of same parent only. Asexual reproduction does not involve the fusion of two gametes.
20. d. None. Male will have XY in which X is affected. For disease to be expressed homozygous recessive condition is required that is both the X should be allele causing color blindness. Since an offspring receives only one gamete (one allele) from a parent, none of the offsprings will have color blindness.
21. a. Phenotype
22. b. Two alleles of a gene on homologous chromosomes
23. c. AA and Aa
24. d. They are both heterozygous for the CF gene
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