Meiosis is cell division that creates gametes in sexually reproducing organisms. Chromosomes are randomly assorted and are distributed independently into four gametes. Which of the following BEST describes the genetic material in the four gametes?
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1 point
Each gamete created during meiosis has a unique genetic makeup
The genetic material in each gamete is exactly the same
Gametes contain double the amount of chromosomes as the parent cell
The chromosome number of the gametes is equal to that of the parent cell
Each gamete created during meiosis has a unique genetic makeup
Meiosis generates gametes for sexual reproduction. The mixing of the blue and red chromosomes in the model below demonstrates a process known as crossing over. Crossing over occurs during prophase 1 of meiosis. Complete the statement based on the image of meiosis. "Crossing over is the exchange of genetic material between homologous pairs of chromosomes. This process __________ the variation in the resulting gametes because each contains __________ versions of the original genetic material."
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1 point
Captionless Image
increases, identical
increases, different
decreases, different
decreases, identical
increases, different
A dihybrid cross displays the possible allele combinations for two different traits. In pea plants, seed can be yellow (dominant) or green (recessive). They can also have a smooth seed texture (dominant) or wrinkled (recessive). Using the diagram below, identify the probability (as a percentage) of offspring with YELLOW SEEDS and WRINKLED TEXTURE.
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1 point
Captionless Image
9/16 (56.25%)
12/16 (75%)
3/16 (18.75%)
Option 4
3/16 (18.75%)
Which of the following represent possible homozygous genotypes of a diploid cell?
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1 point
Aa
A
s
AA
AA
According to Mendelian genetics, what phenotypic outcome do you expect in the progeny when you cross a heterozygote (Aa) with a homozygous dominant individual (AA)?
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1 point
75% will have the dominant phenotype, 25% will have the recessive phenotype
25% will have the dominant phenotype, 75% will have the recessive phenotype
50% will have the dominant phenotype, 50% will have the recessive phenotype
All with have the dominant phenotype
All with have the dominant phenotype
During prophase 1 of meiosis, genetic material is exchanged between homologous pairs of chromosomes. This increases the variation in the resulting gametes because each gamete contains different versions of the original genetic material. This process is known as ____________.
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1 point
genetic matching
crossing over
primary heredity
chromosome matching