Multiple Choice
A human egg with 22 chromosomes (missing a sex chromosome) that is fertilized by a normal sperm will result in which of the following zygotic conditions?
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3. Extensions to Mendelian Inheritance
Sex Chromosome
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During meiosis the XY sex chromosomes segregate independently. Which of the following represents the gametes chromosomes after meiosis?
A
Two haploid cells that each contain X or Y
B
Two diploid cells that both contain an XY
C
A single diploid cell that contains XY
D
Four haploid cells – two contain X and two contain Y
Verified step by step guidance1
Understand that meiosis is a process that reduces the chromosome number by half, resulting in haploid cells from a diploid cell.
Recall that humans have 23 pairs of chromosomes, including one pair of sex chromosomes (XX for females and XY for males).
During meiosis I, homologous chromosomes (including the sex chromosomes) are separated into different cells. For males, this means the X and Y chromosomes are separated.
In meiosis II, the sister chromatids of each chromosome are separated, resulting in four haploid cells.
Since the original cell is XY, after meiosis, you will have four haploid cells: two containing the X chromosome and two containing the Y chromosome.
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