BIO 352 Lecture Notes - Lecture 11: Punnett Square, Dihybrid Cross, Mendelian Inheritance
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**2 questions, Can someone help explain the firstquestion. The second one, I just need someone to help see if I didit right.
Tomato Plants
In tomato plants, round fruit (R) is dominant to oval fruit(r). Pure breeding plants with red and round fruit(FFRR) were crossed to pure breeding plants with yellowand oval fruit (ffrr).
The red and round F1 progeny were then testcrossed toplants that were homozygous recessive for both genes(ffrr) with the following results:
Phenotypes | Number of Offspring |
---|---|
Red and round | 2 255 |
Red and oval | 290 |
Yellow and round | 310 |
Yellow and oval | 2 145 |
Complete a Punnett square to determine the expected testcrossprogeny on the basis of Mendel’s Law of Independent Assortment.
Tomato Plant Leaves
In tomatoes, regular leaves (L) are multilobed andserrated and potato leaves (l) are broad, smooth, andsingle (Image 1). Red fruit (F) is dominant toyellow fruit (f).
A cross is carried out between two pure lines of tomato plants,one having regular leaves and red fruit and the other having potatoleaves and yellow fruit. The F1 generation all haveregular leaves and red fruit. TheF1 individuals are then crossed with one another.
Complete a Punnett square to determine the expectedF2 progeny on the basis of Mendel’s Law of IndependentAssortment, which states that the alleles for one gene segregateindependently of the alleles for other genes during gameteformation.
RL | Rl | rL | rl | |
RL | RRLL | RRLl | RrLL | RrLl |
Rl | RRLl | RRll | RrLl | Rrll |
rL | RrLL | RrLl | rrLL | rrLl |
rl | RrLl | Rrll | rrLl | rrll |
*******************Did I get the right F1? RrLlxRrLl?
Is my punnett square correct? If not, can someone explain