Question
please help me with these
owing paragraph and ans 8 ques mnts realized that her body was not develo of her friends and was not going g properly about e time she was 12 years old. She was shorte through changes normally associated with female puberty. took h eatures ordered a karyotype ble to ed his diagnosis Amanda was born with only one x chromosome. Although there is no specilic cure to treat her and correct some of the problems associated with condition. For example, she received growth improve her growth and estrogen to help her develop the physical changes of puberty as a as Amanda's abnormal number of sex chromosomes resulted from A) crossing over B) independent assortment of chromosomes C) nondisjunction D) random fertilization 39) This hypothetica pedigree for a disease in humans ustrated inheritance that is B) autosomal recessive A) carried on the Y chromosome. D) sex-linked dominant. C) autosomal dominant. 40) Alleles are described as A) alternate phenotypes B) environmental factors that affect gene expression C) homologous chromosomes D) alternate versions of a gene 41) A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green 41) seeds. The seeds of all of the offspring are yellow. Why? A) The alleles are codominant. B) The yellow allele is recessive to the green allele. C) The yellow allele is dominant to the green allele. D) All of the offspring are homozygous yellow 42) 42) According to Mendel's law of segregation, A) two alleles segregate into each gamete B) gametes have one allele copy for each gene than carrying the recessive C) more gametes carrying the dominant allele are produced gametes allele D) gametes are diploid
Explanation / Answer
38: C) Nondisjunction, Amanda is aneuploid for X chromosome which occurs due to nondisjunction of X chromosomes during meiosis resulting in formation of aneuploid gametes. Fertilization of egg with no X chromosome with sperm having one X chromosome resulted in absence of X chromosome in her cells.
39: B)Autosomal recessive; Since in G II, 6 and 7 normal parents give the affected progeny; the trait is recessive. Since the trait is present in females as well, it is not the Y linked trait. It is autosomal recessive.
40: D) Alternate forms of a gene are called as alleles.
41: C) Since the progeny exhibit yellow seeds only irrespective of presence of the allele for green seeds; yellow is dominant over the green color.
42: A) Segregation of two allels of a particular gene leads to formation of pure gametes.
