There are several ways by which a skeletal system <span>help aid the body when its sick. Firstly, it helps in producing red blood cells in the body. It also helps in maintaining the level of calcium in the body. It also produces the stem cells that increases the immunity of the body. I hope that the answer has come to your help.</span>
the rock record provides evidence of past human civilizations
Answer: Only options A, B, C and D are true statements
A) One sperm fuses with an egg while the other sperm fuses with the polar nuclei.
B) It results in the formation of a diploid embryo and triploid endosperm.
C) Both sperms involved in double fertilization form within the same pollen tube.
- The diploid nucleus resulting from the second fertilization undergoes meiosis to form the endosperm.
Explanation:
Double fertilization is a process that occurs in only flowering plants. It involves the following:
- A pollen grain produces TWO male gametes
- one male gamete fertilize the egg to form a zygote that is DIPLOID (with two basic sets of chromosomes)
- the second male gamete fuses with another cell named POLAR NUCLEI, to form endosperm (the food storing tissue) in the seed. The endosperm formed is TRIPLOID ( it has three sets of chromosomes), having undergone reductive division - meiosis
Thus, the options A, B, C and D are true statements
If a homozygous short plant (tt) is crossed with a heterozygous tall plant (Tt), the percentage of tall offsprings is 50% and the percentage of short offspring is 50%.
- A heterozygous tall pea plant will have the genotype "Tt" and a homozygous short pea plant will have the genotype "tt" because homozygous means that both alleles are identical.
- Since 'T' is dominant over 't', any plant with at least one "T" allele will be tall (the dominant trait), regardless of what the other allele is.
- The punett square of the following problem will have 2 squares with Tt genotype and 2 squares with tt genotype.
Hence, the genotypic ratio of F1 generation will be
Tt : tt
1 : 1
And phenotypic ratio of F1 generation will be
Tall : Short
1 : 1
To know more about mendelian genetics
brainly.com/question/11797208
Answer:
Homozygous dominant genotype means both the alleles ( alternative form of a gene) are same. ... AA shows that both the alleles are same and are dominant
Explanation:
