Answer:
- E/e ; T/t ⇒ Square eyes and long tail (Option D)
- 3/16 will have round eyes and long tails (Option C)
- 1/4 of the progeny will be heterozygous for both traits (Option A)
Explanation:
<u>Available data</u>:
- Two diallelic unlinked genes
- Gene E controls eye shape: Dominant allele E expresses square eyes, and recessive allele e expresses round eyes.
- Gene T controls the tail size. Dominant allele T expresses long trail, and recessive allele t expresses short tail.
<u>Genotypes Phenotypes</u>
EETT, EeTT, EETt, EeTt Square eyes and Long tail
eeTT, eeTt Round eyes and Long tail
EEtt, Eett Square eyes and Short tail
eett Rounf eyes and short tail.
<em>1. An individual of this new species is heterozygous for gene E and heterozygous for gene T. What is their genotype and phenotype?</em>
The heterozygous individual is E/e ; T/t, expressing square eyes and a long tail.
<em>2. Two individuals, who are both heterozygous for eye shape and tail size, mate. Which of the following is a correct statement about the phenotype ratios expected for their offspring?</em>
Cross: between two heterozygous individuals
Parentals) EeTt x EeTt
Gametes) ET, Et, eT, et
ET, Et, eT, et
Punnett square) . ET Et eT et
ET EETT EETt EeTT EeTt
Et EETt EEtt EeTt Eett
eT EeTT EeTt eeTT eeTt
et EeTt Eett eeTt eett
F1) Genotype:
- 1/16 EETT
- 2/16 EETt
- 1/16 EEtt
- 2/16 EeTT
- 4/16 EeTt ⇒ 1/4 EeTt
- 2/16 Eett
- 1/16 eeTT
- 2/16 eeTt
- 1/16 eett
Phenotype
- 9/16 E-T-, Square eyes and Long tails
- 3/16 E-tt, Square eyes and short tails
- 3/16 eeT-, Round eyes and Long tails
- 1/16 eett, round eyes and short tail
Phenotypic ratio 9:3:3:1
<em>3. From the mating described in question ABOVE, what proportion of ALL of the offspring in will be heterozygous for both traits?</em>
4/16 = 1/4 = 25% of the progeny are expected to be heterozygous for both traits, EeTt.
The answer is C) 550 I think
<span>If each of the pairs of
chromosomes was heterozygous (what gives you the highest potential
number of different gametes), then the number of possible gametes
increases from 4 to 8 for a diploid organism. To figure out how many
are possible, raise the number of homologous chromsomes (2 for a diploid
organism) to the power of the number of chromosomes. So if you have
two different chromosomes (A and B), raise 2 to the 2nd power (or
multiply 2 x 2) and you have 4. If you have chromosomes A, B, and C,
then you have 2^3, or 2 x 2 x 2 = 8.
To show possible combinations, AaBb gives you AB, Ab, aB, or ab. AaBbCc
gives possible gametes of ABC, ABc, AbC, Abc, aBC, aBc, abC, and abc. </span>
The answer would be the last one because a deletion changes every codon configuration that follows it and thus changes the amino acid that codes for that codon
Answer:
Earthworm - have a coelom and a closed circulatory system.
Scallops or clams - has a mantle and an open circulatory system.
Starfish - has an endoskeleton made of calcium-rich plates.
Spider - exhibits the phenomenon of molting.
Explanation:
Earthworm belongs to Phylum Annelida. They are metamerically segmented, triploblastic and bilaterally symmetrical. They have a closed circulatory system and a coelom (true body cavity).
Scallops or clams belong to Phylum Mollusca, the second largest animal phylum. They are coelomate, triploblastic, bilaterally symmetrical organisms having an open circulatory system. They have a calcareous shell covered body with a distinct head, muscular foot, visceral hump and a mantle (soft and spongy layer of skin) over the hump.
Starfish belongs to Phylum Echinodermata, which consists of exclusively free-living marine organisms. They have an endoskeleton made up of calcium carbonate structures. They are coelomate, triploblastic and have a water vascular system that is used for respiration, locomotion, food capture and transport.
Spiders belong to Phylum Arthropoda. They have chitinous covered segmented bodies, jointed legs and exoskeletons (hard external shells). Arthropods periodically shed their exoskeletons or shells in order to grow, this process is called molting. They are coelomate, triploblastic, bilaterally symmetrical organisms having an open circulatory system.
