7. What are Mendel\'s two principles (laws) of inheritance? How can these princi

Question

7. What are Mendel's two principles (laws) of inheritance? How can these principles be explained by the events of meiosis? For questions 8-18, assume Mendelian rules of inheritance. 8. A pea plant that is heterozygous and has purple flowers is crossed with a pea plant that has white flowers (purple is dominant over white). What phenotypes, in what proportions, will be present in the Fi generation? 9. In a cross between a black Guinea pig and a white Guinea pig, all members of the Fi generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white Guinea pigs. a) Diagram this cross, showing the genotypes and phenotypes. b) If two Fz white Guinea pigs are crossed, what will be the appearance of the offspring? 10. A man and a woman have three children: two girls and one boy. The couple decides to have a fourth child. What is the probability that their fourth child will be a girl? MacBook Air F1 F2 F3 F5

Explanation / Answer

8) Pw X ww

P

w

w

Pw

ww

w

Pw

ww

I/2 of the phenotypes will be purple and ½ of the phenotypes will be white in F1 generation.

9) A) BB X ww

F1 generation: Bw (all black)

B

w

B

BB

Bw

w

Bw

ww

Genotype ratio: 1 (BB) : 2 (Bw) : 1 (ww)

Phenotype ratio: 3 (black) : 1(white)

B) If two F2 white Guinea pig are crossed, the appearance of offspring will be all white.

P

w

w

Pw

ww

w

Pw

ww

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