HEREDITY
MONOHYBRID CROSS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
be homozygous
|
|
|
display the same phenotype as the RR parent
|
|
|
display the same phenotype as the rr parent
|
|
|
have the same genotype as the RR parent
|
|
|
have the same genotype as the rr parent
|
Detailed explanation-1: -An individual who carries two copies of the same allele (i.e. RR or rr) is called a homozygote (homo = same, zygote = embryo). Homozygotes produce genoctypially identical offspring when allowed to self-fertilize. There are dominant homozygotes (i.e. RR individuals) and recessive homozygotes (i.e. rr individuals).
Detailed explanation-2: -Dominant and Recessive Alleles If the genotype for seeds was Rr (where R is dominant and r is recessive), R would supersede the recessive gene and the plant would express a round seed phenotype.
Detailed explanation-3: -A homozygous plant contains either of the following alleles for seed shape: (RR) or (rr). The (RR) genotype is homozygous dominant and the (rr) genotype is homozygous recessive for seed shape.
Detailed explanation-4: -Rr x Rr. You’ll note here that all offspring are not pink. Your genotypic ratio is 25% (RR), 50% (Rr), and 25% (rr). The phenotypic ratio is also the same in this case, with 25% red (RR), 50% pink (Rr), and 25% white (rr).