Biology Middle School

The common grackle is a species of robin-sized blackbirds that are fairly common (hence the name) over most of the United States. Suppose that long tails (L) were dominant to short tails (l) in these birds. A female short-tailed grackle mates with a male long-tailed grackle whose mother was short tailed and father had a long tail. What is the probability of a short-tailed offspring?

Answers

Answer 1
Answer:
Long tail (Ll) = 1/2 or 50%
Short tail (ll) = 1/2 or 50%
Explanation:
This question involves a single gene coding for tail length in grackle birds. The allele for long tails (L) were dominant to short tails (l) in these birds. This means that a bird that is heterozygous (Ll) for the gene will be phenotypically long tailed.
According to the question, a female short-tailed grackle (ll) mates with a male long-tailed grackle that had one parent with a long tail and one parent with a short tail. This male grackle will have a genotype: Ll because of his parental genotype. Hence, crossing ll × Ll, the following gametes will be produced by each parent:
Ll (male) = L and l
ll (female) = l and l
Using these gametes in a punnet square (see attached image), the following proportion of offsprings will be produced:
Ll, Ll, ll and ll
2 Ll out of 4 are long-tailed i.e 1/2 or 50% probability
2 ll out of 4 are short-tailed i.e 1/2 or 50% probability
Answer 2
The probability of a short-tailed offspring in this scenario is 1/4 or 25%. This is because the female grackle has the genotype ll (homozygous recessive) and the male grackle has the genotype Ll (homozygous dominant). When these two genotypes are crossed, the resulting offspring can have any of the three genotypes (LL, Ll, or ll) with equal probability. Since one of these genotypes (ll) is associated with short tails, the probability of a short-tailed offspring is 1/4 or 25%.

Related Questions

WILL GIVE BRAINLIEST 40 PTS Classify each of the characteristics and examples as belonging to plant cells (P), animal cells (A),
or bacterial cells (B). Some characteristics may apply to more than one cell type.
_________ a. prokaryotic cell
_________ b. large vacuole for water storage
_________ c. example: blood cell
_________ d. enclosed nucleus
_________ e. smallest cell type
_________ f. eukaryotic cell
_________ g. has a cell membrane
_________ h. linear DNA
_________ i. no membrane-bound nucleus
_________ j. cell wall made of cellulose
_________ k. circular DNA
_________ l. has chloroplasts
_________ m. microscopic
_________ n. example: E. coli

Answers

Answer:

a. prokaryotic cell - B

b. large vacuole for water storage - P

c. example: blood cell - A

d. enclosed nucleus - A

e. smallest cell type - B

f. eukaryotic cell - A

g. has a cell membrane - A, P, B

h. linear DNA - B

i. no membrane-bound nucleus - B

j. cell wall made of cellulose - P

k. circular DNA - B

l. has chloroplasts - P

m. microscopic - A, P, B

n. example: E. coli - B

Answer:

a.  prokaryotic cell - B

b.  large vacuole for water storage - P

c.  example: blood cell - A

d.  enclosed nucleus - A

e. smallest cell type - B

f.  eukaryotic cell - A

g.  has a cell membrane - A, P, B

h. linear DNA - B

i. no membrane-bound nucleus - B

j. cell wall made of cellulose - P

k. circular DNA - B

l.  has chloroplasts - P

m. microscopic - A, P, B

lol i had a test on this.

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