Step-by-Step Solution
The cross of Neurospora crassa can be used to prove the first law of Mendel which states that when an organism produces gametes, only a single copy of alleles is sent into the gamete. This is called the law of segregation.
(a) The diploid nuclei are shown in red in the diagram. This cell containing diploid nuclei are due to cross fertilization seen in Neurospora crassa. Since this organism is unisexual, it cannot mate with itself. After mating with another strain, it produces these diploid meiocytes containing diploid nuclei.
(b) The part of the figure which illustrates Mendel’s first law is the process of ascus formation marked in red. The alleles present in the diploid meiocytes are distributed to the asci based on the principle of segregation. The two copies of a gene present in the meiocyte will separate so that only one copy comes into the ascus.
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