Which of the following is true about chromosomes?

Biology

2 answers:

nadezda [96]3 years ago

8 0

C) Sperm and eggs are haploid. All others are diploid.

klasskru [66]3 years ago

4 0

The answer for this question is letter C. It is true that sperm and eggs have half the chromosomes as other cells. <span> The sperm and/or the egg cell each only has 23 chromosomes, half of the original number, so that when they join to form a zygote when fertilization occurs, the zygote will have a total of 46 chromosomes, like every cell in a human does.</span>
The others cannot be the right answer for the following reasons:
A - <span>The complexity of an organism dos not depend on the number of chromosomes.
B - Nucleus is the only place where you can find chromosomes.
D - DNA and other proteins makes up the chromosomes.</span>

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In a species of chickens, incomplete dominance between alleles for black (B) and white(w) feathers

MariettaO [177]

Answer:

1/2

Explanation:

This question involves a single gene coding for feather color in chickens. The black allele (B) is incompletely dominant over the white allele (W). This means that the allele B will not mask the phenotypic expression of allele W, hence, a third intermediate blue phenotype (BW) will be produced.

According to the question, if two blue chickens are crossed i.e. BW × BW, the gametes B and W will be produced by each parent. Using these gametes in a punnet square (see attached image), the following offsprings will be produced:

BB, BW and WW in the ratio 1:2:1

BB is black, BW is blue, WW is white. Hence, the probability of producing a blue chicken from this cross is 1/2.