If chromosomal nondisjunction occurs during meiosis I, what proportion of zygotes formed from the resulting gametes would be aneuploid? (Assume the gametes from the other parent are normal)a) 0% b) 25% c) 50% d) 75% e) 100%

The karyotypes shown here depict chromosomal abnormalities. Name the syndromes and if they are male or female?

There are 3 possible diploid genotypes at a locus with 2 alleles. a) True b) False

In fruit flies, chromosomal crossing over does not occur in meiosis in males, whereas crossing over does occur in meiosis in females. In fruit flies that are heterozygous at many genes (i.e. many maternal and paternal versions of the genes differ), at what stage would cells no longer be heterozygous for any gene during the process of meiosis? a)After the second meiotic division in males, and after the first meiotic division in females. b)After the second meiotic division in both males and females. c)After the first meiotic division in both males and females. d)After the first meiotic division in males, and after the second meiotic division in females.

Which of the following statements is true? Select one: a. Nondisjunction during anaphase I or anaphase II will have no effect on the gametes formed. b. More gametes will be affected if nondisjunction occurs during anaphase I than if nondisjunction occurs during anaphase II. c. More gametes will be affected if nondisjunction occurs during anaphase II than if nondisjunction occurs during anaphase I. d. Nondisjunction during anaphase I or anaphase II will have the same effect.

3- In nondisjunction disorder, if it happens in meiosis I, it will be to if it happens in meiosis II. a) Less b) More c) Both have the same impact d) None of the above harmful Compared

If an non disjunction occurs in meiosis 2 in a male and the resulting sperm fertilizes a normal female egg, which of the following coujld result. Check ALL that apply a) YO b) XYY c) XXY d) XXX e) XO Polar bodies are formed during Male meiosis Female meiosis Both male and female meiosis Neither male nor female meiosis A brain cell in a normal human male would have a Y chromosome. a) True b) False