In plants, genes involved in chlorophyll synthesis are in both the nucleus and chloroplasts. Some variegated plants (with both green and white leaves and shoots) have mutations that prevent them from synthesizing chlorophyll throughout their leaves. To understand the genetics underlying chlorophyll synthesis, scientists performed the crosses shown in Figure 1. Figure 1. Crosses of flowers on a variegated plant and the resulting progeny (A) Describe how genetic information is carried in chloroplasts and mitochondria (1 point). (B) Explain how the inheritance pattern shown in Figure 1 supports a role for chloroplast genes in the production of chlorophyll in the variegated plants (1 point). (C) Ovules produced by an entirely green plant contain a rare mutation in a nuclear gene that is involved in chlorophyll synthesis, and the gene encodes a nonfunctional protein. Predict the most likely color of the leaves on plants that are produced when these ovules are fertilized by pollen from a wild-type green plant (1 point). (D) Provide reasoning to justify your prediction (1 point).
Answers
Answer:
White Flower.................
Answer:
(A) Chlorophyll production genes are found in both the nucleus and chloroplasts of plants.
(B) A pure green progeny will be born from the branch's green eggs, which contain green chloroplasts. As a result, a branch that is all white will produce ovules that are entirely composed of white chloroplasts, giving rise to an entirely white child.
(C) The presence of chloroplast is what gives the ovule its green hue. The green of the plant and the colour of the ovule are both determined by genes. Therefore, the genes are in charge of producing the green pigment in the chloroplast and in plants.
Explanation:
Step : 1 Some plants that have both green and white leaves and stems, or that are variegated, have mutations that prevent them from producing chlorophyll throughout their leaves. Scientists carried out the crosses depicted in Figure 1 to comprehend the genetics behind chlorophyll production. Figure 1 shows the progeny of floral crosses on a variegated plant (A) Describe how mitochondria and chloroplasts carry genetic information (1 point).
Step : 2 In more than 95% of zygotes, chloroplast genes are solely inherited from the mt+ parent, whereas mitochondrial genes are only inherited from the mt parent. In this instance, selective silencing—the preferential breakdown of organelle DNA from one parent—causes uniparental inheritance. Chloroplasts are organelles that use sunlight to create sugars as sustenance for plants and algae. These two organelles exhibit cytoplasmic inheritance as a result of having their own genetic makeup.
Step : 3 The presence of chloroplast is what gives the ovule its green hue. The green of the plant and the colour of the ovule are both determined by genes. Therefore, the genes are in charge of producing the green pigment in the chloroplast and in plants.
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