. The first round of cell division e of melosis is most like mitosis? C. When bi
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. The first round of cell division e of melosis is most like mitosis? C. When binary fission occurs d. During metaphase 1 e. There are no similarities. 24. A dihybrid cross examines inheritance patterns betwoon a. a mother and a father b. many generations of families. c. 2 alleles of 1 gene. d. 2 alleles of 2 genes. e. 2 alleles of 3 genes. Q 25-27: Indicate the the predicted ratio of the following crosses of purple and white flowers. Use the Punnett square to help you! 25.PP X pp a. all purple b. all white c. all light purple d. a mixture of 3 purple and 1 white e. a mixture of 2 purple and 2 white. 26.Pp X Pp a. all purple b. all white c. all light purple d. a mixture of 3 purple and 1 white e. a mixture of 2 purple and 2 white. 27.Pp X pp a. all purple b. all white c. all light purple d. a mixture of 3 purple and 1 white e. a mixture of 2 purple and 2 white. ts Mendel inheritance model, which do we now know is a. Parents transmit discrete factors (genes). b. Each individual receives one copy of a gene from each parent. c. Not all copies of a gene are identical. d. Alleles remain discrete-no blending occurs. e. Presence of allele does not guarantee expression. 28. Of the 5 element not necessarily true?Explanation / Answer
24. Option D is correct.
A dihybrid cross involves the interaction between two alleles of two different genes each (total four alleles).
25. Option A is correct.
PP X pp => Pp. All progeny are purple.
26. Option D is correct.
Pp X Pp => PP Pp Pp pp.
Phenotypic ratio = 3 (purple): 1 (White)
27. Option E is correct.
Pp X pp => PP Pp pp pp.
Phenotypic ratio = 1 (purple): 1 (White)
28. Option E is correct.
Mendel did not consider the effect on the environment on gene expression. An organism may contain a WT dominant gene sequence, but the gene may be silenced by epigenetic factors.
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