1. In some plants yellow (Y) is dominant to green (g). Cross two plants, one of
ID: 151938 • Letter: 1
Question
1. In some plants yellow (Y) is dominant to green (g). Cross two plants, one of which is heterozygous yellow and the other which is green. Answer the following questions A Give the genotypes of the parents B List the genotypes of the Fl C What is the phenotypic ratio? 2. Two tall plants produced a short plant. If tall is dominant to short, what are the genotypes of the parents? 3. In some plants green (G) stems are dominant to yellow (g) stems and tall (T) plants are dominant to short (t) plants Cross two plants, one of which is heterozygous green and heterozygous tall and the other plant which is yellow and homozygous tall. Answer the following questions: A Give the genotypes of the parents B What is the phenotypic ratio of the F1? 4. List the 2 categories of chromosomes 5. Diploid cells contain the "n" or "2n" number of chromosomes?Explanation / Answer
1. The cross between heterozygous yellow (Yg) and green (gg) plants will generate following offsprings in next generation,
A) Genotrype of Parents : Yg X gg
F1 generation:
Gametes:
g
g
Y
Yg
(Yellow)
Yg
(Yellow)
g
Gg
(Green)
Gg
(Green)
B) Genotypic ratio= Yg : gg
C) Phenotypic ratio= Yellow: green = 2:2 = 1:1
2. As, two domaint trait plants produces a recessive character, the genotype of the parent plants are heterozygous, i.e., Tt.
3. A ) The genotype of the parent would be GgTt (heterozygous green and heterozygous tall) and ggTT ( yellow and homozygous Tall).
B) The phenotypic ratio of F1 generation = green and tall : Yellow and tall = 1:1
4. The chromosome is made up of long strands of deoxyribonucleic acid (DNA). Small segments of genes are present in chromosome which encodes for protein.
In plants and animals, chromosomes are located in nucleus.
5.Diploid cells contains two sets of chromosome. Thus, diploid contains 2n where n refers to no. of chromosome.
Gametes:
g
g
Y
Yg
(Yellow)
Yg
(Yellow)
g
Gg
(Green)
Gg
(Green)
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