Refer to this portion of a dichotomous key for fish identification to answer the question 1. (a) Has a single dorsal fin 5 (b) H
as a double dorsal rsal fin 2 5. (a) Has small fin on back near tail 6 (b) Has no fin on back near tail 6. (a) Has barbs near the mouth Catfish (bDoes not have barbs near the mouth h 10 What do the numbers after the arrows represent?
A. the number of the question that should be considered next ( this one is correct)
B.the number of points that should be added to the organism's identity total
C. The probability that the organism has the described characteristic
D. the number of species that have the described characteristic
A. the number of the question that should be considered next ( this one is correct)
B.the number of points that should be added to the organism's identity total
C. The probability that the organism has the described characteristic
D. the number of species that have the described characteristic
1 answer:
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Answer:
25%
Explanation:
We have 2 independent genes with 2 alleles each: L/l and W/w
- W_: whiskers
- ww: no whiskers
- L_: long whiskers
- ll: short wiskers
Individuals with short whiskers will have the genotype <em>WWll </em>or <em>Wwll</em>.
<u>A cross between a rat heterozygous for both genes and a homozygous recessive rat is done:</u>
<h3>WwLl x wwll</h3>-The homozygous rat will produce only <em>wl </em>gametes.
-The heterozygous rat will produce the following gametes: <em>WL</em>, <em>Wl</em>, <em>wL</em>, <em>wl</em>.
If you do a Punnett Square, you'll get that 25% of the offspring will be WwLl and will have short whiskers.
