Occasionally, chromosomes fail to separate during called meiosis, leading to dau
ID: 164842 • Letter: O
Question
Occasionally, chromosomes fail to separate during called meiosis, leading to daughter cells that have an abnormal number of chromosomes This phenomenon is called epistasis. nondisjunction. crossing over. pleiotropy. chromosome inactivation. In a healthy male, how many sperm cells would be expected to form from 400 primary spermatocytes? 400 secondary spermatocytes? (a) 800; (b) 800 (a) 1600; (b) 1600 (a) 1600; (b) 800 (a) 400; (b) 400 (a) 400; (b) 800 In a healthy female, how many secondary oocytes would be expected to form from 100 primary oocytes? How many first polar bodies would be expected from 100 primary oocytes? 200; 50 100; 50 200; 200 100; 100 50; 50 The sex of birds, some insects, and other organisms is determined by a ZW chromosomal arrangement in which the males have like sex chromosomes (ZZ) and females are ZW (similar to XY in humans) Assume that a recessive lethal allele on the Z chromosome causes death of an embryo in birds. What sex ratio would result in the offspring if a cross wore made between a male heterozygous for the lethal allele and a normal female? 4:1 male to female 2; 1 male to female 3:1 male to female 1.2 male to female 1: 1 male to female A recessive gene for red-green color blindness is located on the X chromosome in humans. Assume that a woman with normal vision (her father is color-blind) marries a color-blind male. What is the likelihood that this couple's first son will be color-blind? 0% 25% 50% 75% 100%Explanation / Answer
Ans 18 B nondisjunction
When homologous chromosomes or sister chromatids fail to seperate during cell division it is called as nondisjunction. It can be during mitosis, meiosis I or even meiosis II.
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