Genetics questions 1. An orchid breeder noticed that a few plants from a recent
ID: 148547 • Letter: G
Question
Genetics questions
1. An orchid breeder noticed that a few plants from a recent cross display a novel purple pattern in the shape of a star on their petals. This new pattern quickly sells out, and the reeder wants to produce more. Getting a pure-breeding line would be ideal, but this is proving to b fair e a challenge; every time two purple star orchids are crossed, the breeder ends up with a white coloration. In the most recent purple star orchid self-cross, there are 57 purple star and 27 What's going on here? In a few sentences explain why you think that, including naming number of purple star flowers, but still a significant number of orchids featuring the standard standard orchids. All other such matings gave similar phenotypic offspring ratios. alleles and using a Punnett square. (3 points) 2. There are multiple alleles that determine eye color in rabbits; eye' encodes red eyes, eye encodes brown eyes, and eye" encodes white eyes. These alleles display complete dominance in the order (eye > eye > eye") a. If an individual were eye'leye", what color would their eyes be? (0.5 point) n eye eye individual with one that has white eyes, what are the odds of having a brown-eyed baby bunny? (1 point) A new mutation in that gene produces ve eye' allele. What might an eye'/eye nat gene produces yellow eyes (eye') and is codominant with the might an eye Yeye individual look like? (0.5 C.Explanation / Answer
The above-mentioned case could be of duplicate recessive interaction. This generally gives the phenotype in 9:7 ratio.
Explanation:
In duplicate recessive interaction, when a duplicate set of same alleles is present, they give a different trait else the regular trait.
Say white orchids genotype: AaBb
Self-cross of white orchids: AaBb X AaBb
AB
Ab
aB
ab
AB
AABB
AABb
AaBB
AaBb
Ab
AABb
AAbb
AaBb
Aabb
aB
AaBB
AaBb
aaBB
aaBb
ab
AaBb
Aabb
aaBb
Aabb
It will give 9 white and 7 purple orchids.
Further self-cross of purple orchids could give a different ration as mentioned in the question
For example, self-cross of one of the purple orchids genotype (aaBb X Aabb) can give 50% colored and 50% white orchids.
aB
ab
Ab
AaBb
Aabb
Ab
AaBb
aabb
AB
Ab
aB
ab
AB
AABB
AABb
AaBB
AaBb
Ab
AABb
AAbb
AaBb
Aabb
aB
AaBB
AaBb
aaBB
aaBb
ab
AaBb
Aabb
aaBb
Aabb
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