From a cross, a sunflower plant exhibits the dominant phenotype of yellow petal
ID: 71449 • Letter: F
Question
From a cross, a sunflower plant exhibits the dominant phenotype of yellow petal color. The genotype of this plant:
a. cannot be determined without molecular analysis of its DNA
b. is homozygous for the dominant allele
c. is heterozygous for the dominant allele
d. can be determined by a test cross to a plant that is phenotypically dominant yellow petals.
e. can be determined by a test cross to a rat that is phenotypically recessive white petals.
4). New combinations of linked genes cannot occur without:
a. Nondysjunction
b. the random nature of the fertilization of ova by sperm.
c. the random distribution of the sister chromatids to the two daughter cells during anaphase II.
d. independent assortment of chromosomes
e. crossing over
what is a nondysjunction?
Explanation / Answer
d. can be determined by a test cross to a plant that is phenotypically dominant yellow petals.
4) E-crossing over
Non dysjunction is the phenomenon of the failure of homologous chromosomes or sister chromatids to separate properly during cell division. These are of three types.
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