In Meiosis I, the members of each chromosome pair separate and end up in different cells.
A Punnett square is actually a way to show the events that occur at meiosis.
When the chromosome pairs separate and go into two different sex cells, so do the alleles carried on each chromosome. One allele from each pair goes to each sex cell.
Move through the activity to view the separation and probable distribution of alleles.
In the figure, you can see how the Punnett square accounts for the separation of alleles during meiosis.
As shown across the top of the Punnett square, half of the sperm cells from the male parent will receive the chromosome with the T allele. The other half of the sperm cells will receive the chromosome with the t allele.
In this example, the same is true for the egg cells from the female parent, as shown down the left side of the Punnett square. Depending on which sperm cell combines with which egg cell, one of the allele combinations shown in the boxes will result.
The body cells of humans contain 23 chromosome pairs, or 46 chromosomes. Chromosomes are made up of many genes joined together like beads on a string.
Although you have only 23 pairs of chromosomes, your body cells each contain between 20,000 and 25,000 genes. Each gene controls a trait.
How do the cells formed in Meiosis I differ from those formed in Meiosis II?
During Meiosis I, the chromosome pairs, each with two chromatids, separate into two different cells. During Meiosis II, the chromatids separate, resulting in a single chromosome in each sex cell
Which describes meiosis I?
Centromeres hold the two chromatids together.
The chromosomes move to the center of the cell.
A copy of each chromosome in the cell is copied.
The chromosome pairs line up in the center of the cell.
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