A. Variations exist among members of a species.
Answer:
Because haploid organisms have only one set of chromosomes
Explanation:
Haploid organisms, unlike diploid that contain two sets of chromosomes (2n), have only one set of chromosomes (n). This means that they only have one gene copy and one allele (variant) for that gene. So, there is no recessive or dominant relationship.
Humans are diploid organisms, meaning that their cells have 2n chromosomes with the exception of gametes. Gametes are formed during the reduction division (meiosis) in which chromosome number is reduced to half.
So, when to gametes fuse, during the fertilization, formed new organism contain two sets of chromosomes (one from father and one from mother).
Answer:
The correct genotypic ratios for the F1 progeny is 1 round eyes : 1 raisin eyes (Option c)
Explanation:
<u>Available data:</u>
- round eyes (rai+) are dominant to raisin eyes (rai)
- round eyes are found in wild-type flies,
- raisin eyes are the result of a mutant allele
Cross: A heterozygous parent (rai+ rai) is crossed with a homozygous recessive parent (rai rai)
Parental) rai+ rai x rai rai
Gametes) rai+ rai rai rai
Punnet square) rai+ rai
rai rai+ rai rai rai
rai rai+ rai rai rai
F1) Progeny genotype: 2/4= 1/2 rai+ rai, round-eyed individuals
2/4=1/2 rai rai, raisin-eyed individuals
The correct genotypic ratios for the F1 progeny is 1 round eyes : 1 raisin eyes