9. In pea plants purple flowers are dominant to white flowers Two white flowered
ID: 219050 • Letter: 9
Question
9. In pea plants purple flowers are dominant to white flowers Two white flowered plants are crossed... What percentage of their offspring will have white flowers? 10. A white flowered plant is crossed with a plant that is heterozygous for the trait. What percentage of the offspring will have purple flowers? - -- 11. Two plants, both heterozygous for the gene that controls flower color are crossed. What percentage of their offspring will have purple flowers? What percentage will have white flowers? 12. In guinea pigs, the allele for short hair is dominant What genotype would a heterozygous short haired guinea pig have? What genotype would a purebreeding short haired guinea pig have? What genotype would a long-haired guinea pig have? Show the cross for two heterozygous guinea pigs. What percentage of the offspring will have short hair? What percentage of the offspring will have long hair?
Explanation / Answer
Ans.
9. as purple flowers are dominant to white flowers, when two white colored plants are crossed, all of the progeny will have white colored flowers i.e., 100%
10. when a white colored plant is crossed with a heterozygous plant
50% of offsprings will have purple flowers
11. when two heterozygousplants are crossed
75% of offsprings will have purple colored flowers.
25% of offsprings will have white colored flowers.
12. in guinea pig allele for short hair is dominant.
suppose dominant allele is S
recessive allele is s
so, the genotype of a heterozygous short haired guinea pig will be Ss
genotype of a pure breeding short haired guinea pig will be SS
genotype of a long haired guinea pig will be ss
cross between two heterozygous guinea pigs -
percentage of guinea pigs with short hair = 75%
percentage of guinea pigs with long hair = 25%
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