Extensions to Mendel Video Lessons

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Problem: Assume that the cell in the figure below is from a crayfish testis and is about to undergo spermatogenesis (gamete production by meiosis). The letters represent alleles at particular gene positions (e.g., A and a alleles for one gene; B and b alleles for another gene, etc.) on eachchromosome.a. Have the chromosomes replicated yet? Is the cell shown haploid or diploid? HOW DID YOU DECIDE? What is the haploid number of a sperm cell from this the crayfish? What is the diploid number of this crayfish’s somatic cells?b. How many chromosomes might you observe in a muscle cell at G0 from this crayfish?c. What are all the possible combinations of alleles that could be found in a gamete produced by the cell in the figure above?d. Which of Mendel's laws tells us that a gamete containing a chromosome with the "A" allele will not necessarily contain a chromosome with a "B" allele?e. Which of Mendel's laws tells us that a gamete cannot contain both an "A" allele and an "a" allele?

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Problem Details

Assume that the cell in the figure below is from a crayfish testis and is about to undergo spermatogenesis (gamete production by meiosis). The letters represent alleles at particular gene positions (e.g., A and a alleles for one gene; B and b alleles for another gene, etc.) on each
chromosome.

a. Have the chromosomes replicated yet? Is the cell shown haploid or diploid? HOW DID YOU DECIDE? What is the haploid number of a sperm cell from this the crayfish? What is the diploid number of this crayfish’s somatic cells?

b. How many chromosomes might you observe in a muscle cell at G0 from this crayfish?

c. What are all the possible combinations of alleles that could be found in a gamete produced by the cell in the figure above?

d. Which of Mendel's laws tells us that a gamete containing a chromosome with the "A" allele will not necessarily contain a chromosome with a "B" allele?

e. Which of Mendel's laws tells us that a gamete cannot contain both an "A" allele and an "a" allele?

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