Biology, 22.07.2019 22:00, tdahna0403

Purple petal color in pea plants is dominant to white petal color. two heterozygous pea plants are crossed. what ratio of the offspring will have white petals? : express this in a percentage. %

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If both parents are heterozygous for the same trait, it means that both parents have both of the alleles, one for purple petals and one for white petals, so the crossing will lead to an offspring that will present the following genotype proportions:
Purple-colored petals (dominant characteristic, both alleles dominant) - 1/4
Purple-colored petals (dominant characteristic, one allele dominant, one allele recessive) - 2/4
White-colored petals (dominant characteristic, both alleles recessive) - 1/4

The ratio of offspring to have white petals will be 1/4 - 25%.

answered: kashishmehta917

The ratio of the offspring will have white petals is 1/4. Which means 25% of the offspring will have white petals.

According To the Mendel's Law:

When two heterogygous parents cross,

Phenotype ratio of offspring with dominant and recessive character is 3:1.Genotype ratio of WW : Ww : ww is 1:2:1.

Find the attachment for cross.

Hence, we can conclude that the ratio of the offspring will have white petals is 1/4. Which means 25% of the offspring will have white petals.

To know more about Law of Dominance, refer to the link:

link

answered: Guest

correct answer is a. and d.

answered: Guest

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.